/*!
* Lo-Dash v0.1.0 <https://github.com/bestiejs/lodash>
* Copyright 2012 John-David Dalton <http://allyoucanleet.com/>
* Based on Underscore.js 1.3.3, copyright 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
* <http://documentcloud.github.com/underscore>
* Available under MIT license <http://mths.be/mit>
*/
;(function(window, undefined) {
'use strict';
/** Used to escape characters in templates */
var escapes = {
'\\': '\\',
"'": "'",
'\n': 'n',
'\r': 'r',
'\t': 't',
'\u2028': 'u2028',
'\u2029': 'u2029'
};
/** Detect free variable `exports` */
var freeExports = typeof exports == 'object' && exports &&
(typeof global == 'object' && global && global == global.global && (window = global), exports);
/** Used to generate unique IDs */
var idCounter = 0;
/** Used to restore the original `_` reference in `noConflict` */
var oldDash = window._;
/** Used to match tokens in template text */
var reToken = /__token__(\d+)/g;
/**
* Used to match unescaped characters in template text
* (older Safari can't parse unicode escape sequences in a RegExp literals)
*/
var reUnescaped = RegExp('\\\\|[\'\\n\\r\\t\u2028\u2029]', 'g');
/** Used to replace template delimiters */
var token = '__token__';
/** Used store tokenized template text code snippets */
var tokenized = [];
/** Object#toString result shortcuts */
var arrayClass = '[object Array]',
boolClass = '[object Boolean]',
dateClass = '[object Date]',
funcClass = '[object Function]',
numberClass = '[object Number]',
regexpClass = '[object RegExp]',
stringClass = '[object String]';
/** Native prototype shortcuts */
var ArrayProto = Array.prototype,
ObjProto = Object.prototype;
/** Native method shortcuts */
var concat = ArrayProto.concat,
hasOwnProperty = ObjProto.hasOwnProperty,
join = ArrayProto.join,
push = ArrayProto.push,
slice = ArrayProto.slice,
toString = ObjProto.toString;
/* Native method shortcuts for methods with the same name as other `lodash` methods */
var nativeIsArray = Array.isArray,
nativeIsFinite = window.isFinite,
nativeKeys = Object.keys;
/** Timer shortcuts */
var clearTimeout = window.clearTimeout,
setTimeout = window.setTimeout;
/** Compilation options for `_.every` */
var everyFactoryOptions = {
'init': 'true',
'inLoop': 'if (!callback(collection[index], index, collection)) return !result'
};
/** Compilation options for `_.extend` */
var extendFactoryOptions = {
'args': 'object',
'init': 'object',
'top':
'for (var source, j = 1, length = arguments.length; j < length; j++) {\n' +
'source = arguments[j]',
'loopExp': 'index in source',
'useHas': false,
'inLoop': 'object[index] = source[index]',
'bottom': '}'
};
/** Compilation options for `_.filter` */
var filterFactoryOptions = {
'init': '[]',
'inLoop': 'callback(collection[index], index, collection) && result.push(collection[index])'
};
/** Compilation options for `_.forEach` */
var forEachFactoryOptions = {
'args': 'collection, callback, thisArg',
'init': 'collection',
'top':
'if (!callback) {\n' +
'callback = identity\n' +
'}\n' +
'else if (thisArg) {\n' +
'callback = bind(callback, thisArg)\n' +
'}',
'inLoop': 'callback(collection[index], index, collection)'
};
/** Compilation options for `_.map` */
var mapFactoryOptions = {
'init': '',
'exit': 'if (!collection) return []',
'beforeLoop': {
'array': 'result = Array(length)',
'object': 'result = []'
},
'inLoop': {
'array': 'result[index] = callback(collection[index], index, collection)',
'object': 'result.push(callback(collection[index], index, collection))'
}
};
/** Compilation options for `_.max` */
var maxFactoryOptions = {
'top':
'var current, computed = -Infinity, result = computed;\n' +
'if (!callback) {\n' +
'if (isArray(collection) && collection[0] === +collection[0])' +
'return Math.max.apply(Math, collection);\n' +
'if (isEmpty(collection))' +
'return result\n' +
'} else if (thisArg) callback = bind(callback, thisArg)',
'inLoop':
'current = callback' +
'? callback(collection[index], index, collection)' +
': collection[index];\n' +
'if (current >= computed)' +
'computed = current, result = collection[index]'
};
/*--------------------------------------------------------------------------*/
/**
* The `lodash` function.
*
* @name _
* @constructor
* @param {Mixed} value The value to wrap in a `Lodash` instance.
* @returns {Object} Returns a `Lodash` instance.
*/
function lodash(value) {
// allow invoking `lodash` without the `new` operator
return new Lodash(value);
}
/**
* Creates a `Lodash` instance that wraps a value to allow chaining.
*
* @private
* @constructor
* @param {Mixed} value The value to wrap.
*/
function Lodash(value) {
this._wrapped = value;
}
/*--------------------------------------------------------------------------*/
/**
* Checks if a `value` is an array.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is an array, else `false`.
* @example
*
* (function() { return _.isArray(arguments); })();
* // => false
*
* _.isArray([1, 2, 3]);
* // => true
*/
var isArray = nativeIsArray || function(value) {
return toString.call(value) == arrayClass;
};
/**
* Checks if a `value` is empty. Arrays or strings with a length of `0` and
* objects with no enumerable own properties are considered "empty".
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is empty, else `false`.
* @example
*
* _.isEmpty([1, 2, 3]);
* // => false
*
* _.isEmpty({});
* // => true
*/
var isEmpty = iterationFactory({
'args': 'value',
'iterate': 'objects',
'init': 'true',
'top':
'var className = toString.call(value);\n' +
'if (className == arrayClass || className == stringClass) return !value.length',
'inLoop': 'return false'
});
/*--------------------------------------------------------------------------*/
/**
* Used by `template()` to replace tokens with their corresponding code snippets.
*
* @private
* @param {String} match The matched token.
* @param {String} index The `tokenized` index of the code snippet.
* @returns {String} Returns the code snippet.
*/
function detokenize(match, index) {
return tokenized[index];
}
/**
* Used by `template()` to escape characters for inclusion in compiled
* string literals.
*
* @private
* @param {String} match The matched character to escape.
* @returns {String} Returns the escaped character.
*/
function escapeChar(match) {
return '\\' + escapes[match];
}
/**
* Compiles iteration functions.
*
* @private
* @param {Object} [options1, options2, ..] The compile options objects.
* @returns {Function} Returns the compiled function.
*/
function iterationFactory() {
var prop,
index = -1,
array = {},
object = {},
options = {},
props = ['beforeLoop', 'loopExp', 'inLoop'];
// use simple loops to merge options because `extend` isn't defined yet
while (++index < arguments.length) {
for (prop in arguments[index]) {
options[prop] = arguments[index][prop];
}
}
// assign the `array` and `object` branch options
while ((prop = props.pop())) {
if (typeof options[prop] == 'object') {
array[prop] = options[prop].array;
object[prop] = options[prop].object;
} else {
array[prop] = object[prop] = options[prop] || '';
}
}
var args = options.args,
firstArg = /^[^,]+/.exec(args)[0],
init = options.init,
iterate = options.iterate,
arrayBranch = !(firstArg == 'object' || iterate == 'objects'),
objectBranch = !(firstArg == 'array' || iterate == 'arrays'),
useHas = options.useHas !== false;
// all strings used to compile methods are minified during the build process
return Function('arrayClass, bind, concat, funcClass, hasOwnProperty, identity,' +
'indexOf, Infinity, isArray, isEmpty, Math, slice, stringClass,' +
'toString, undefined',
// compile the function in strict mode
'"use strict";' +
// compile the arguments the function accepts
'return function(' + args + ') {\n' +
// assign the `result` variable an initial value
('var index, result' + (init ? '=' + init : '')) + ';\n' +
// add code to exit early or do so if the first argument is falsey
(options.exit || 'if (!' + firstArg + ') return result') + ';\n' +
// add code after the exit snippet but before the iteration branches
(options.top || '') + ';\n' +
// the following branch is for iterating arrays and array-like objects
(arrayBranch
// initialize `length` and `index` variables
? 'var length = ' + firstArg + '.length;\n' +
'index = -1;\n' +
// check if the `collection` is array-like when there is an object iteration branch
((objectBranch ? 'if (length === +length) {\n' : '') +
// add code before the while-loop
(array.beforeLoop || '') + ';\n' +
// add a custom loop expression
'while (' + (array.loopExp || '++index < length') + ') {\n' +
// add code inside the while-loop
array.inLoop +
'\n}' +
// end the array-like if-statement
(objectBranch ? '\n}\n' : ''))
: ''
) +
// the following branch is for iterating an object's own/inherited properties
(objectBranch
// begin the else-statement when there is an array-like iteration branch
? ((arrayBranch ? 'else {\n' : '') +
// add code before the for-in loop
(object.beforeLoop || '') + ';\n' +
// add a custom loop expression
'for (' + (object.loopExp || 'index in ' + firstArg) + ') {\n' +
// compile in `hasOwnProperty` checks when `options.useHas` is not `false`
(useHas ? 'if (hasOwnProperty.call(' + /\S+$/.exec(object.loopExp || firstArg)[0] + ',index)) {\n' : '') +
// add code inside the for-in loop
object.inLoop +
(useHas ? '\n}' : '') +
'\n}' +
// end the object iteration else-statement
(arrayBranch ? '\n}\n' : ''))
: ''
) +
// add code to the bottom of the iteration method
(options.bottom || '') + ';\n' +
// finally, return the `result`
'return result' +
'\n}'
)(arrayClass, bind, concat, funcClass, hasOwnProperty, identity,
indexOf, Infinity, isArray, isEmpty, Math, slice, stringClass, toString);
}
/**
* Used by `template()` to replace "escape" template delimiters with tokens.
*
* @private
* @param {String} match The matched template delimiter.
* @param {String} value The delimiter value.
* @returns {String} Returns a token.
*/
function tokenizeEscape(match, value) {
var index = tokenized.length;
tokenized[index] = "'+\n((__t = (" + value + ")) == null ? '' : __e(__t)) +\n'";
return token + index;
}
/**
* Used by `template()` to replace "interpolate" template delimiters with tokens.
*
* @private
* @param {String} match The matched template delimiter.
* @param {String} value The delimiter value.
* @returns {String} Returns a token.
*/
function tokenizeInterpolate(match, value) {
var index = tokenized.length;
tokenized[index] = "'+\n((__t = (" + value + ")) == null ? '' : __t) +\n'";
return token + index;
}
/**
* Used by `template()` to replace "evaluate" template delimiters with tokens.
*
* @private
* @param {String} match The matched template delimiter.
* @param {String} value The delimiter value.
* @returns {String} Returns a token.
*/
function tokenizeEvaluate(match, value) {
var index = tokenized.length;
tokenized[index] = "';\n" + value + ";\n__p += '";
return token + index;
}
/*--------------------------------------------------------------------------*/
/**
* Checks if a given `target` value is present in a `collection` using strict
* equality for comparisons, i.e. `===`.
*
* @static
* @memberOf _
* @alias include
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Mixed} target The value to check for.
* @returns {Boolean} Returns `true` if `target` value is found, else `false`.
* @example
*
* _.contains([1, 2, 3], 3);
* // => true
*/
var contains = iterationFactory({
'args': 'collection, target',
'init': 'false',
'inLoop': 'if (collection[index] === target) return true'
});
/**
* Checks if the `callback` returns a truthy value for **all** elements of a
* `collection`. The `callback` is invoked with 3 arguments; for arrays they
* are (value, index, array) and for objects they are (value, key, object).
*
* @static
* @memberOf _
* @alias all
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} callback The function called per iteration.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Boolean} Returns `true` if all values pass the callback check, else `false`.
* @example
*
* _.every([true, 1, null, 'yes'], Boolean);
* => false
*/
var every = iterationFactory(forEachFactoryOptions, everyFactoryOptions);
/**
* Examines each value in a `collection`, returning an array of all values the
* `callback` returns truthy for. The `callback` is invoked with 3 arguments;
* for arrays they are (value, index, array) and for objects they are
* (value, key, object).
*
* @static
* @memberOf _
* @alias select
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} callback The function called per iteration.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Array} Returns a new array of values that passed callback check.
* @example
*
* var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
* // => [2, 4, 6]
*/
var filter = iterationFactory(forEachFactoryOptions, filterFactoryOptions);
/**
* Examines each value in a `collection`, returning the first one the `callback`
* returns truthy for. The function returns as soon as it finds an acceptable
* value, and does not iterate over the entire `collection`. The `callback` is
* invoked with 3 arguments; for arrays they are (value, index, array) and for
* objects they are (value, key, object).
*
* @static
* @memberOf _
* @alias detect
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} callback The function called per iteration.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Mixed} Returns the value that passed the callback check, else `undefined`.
* @example
*
* var even = _.find([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
* // => 2
*/
var find = iterationFactory(forEachFactoryOptions, {
'inLoop': 'if (callback(collection[index], index, collection)) return collection[index]'
});
/**
* Iterates over a `collection`, executing the `callback` for each value in the
* `collection`. The `callback` is bound to the `thisArg` value, if one is passed.
* The `callback` is invoked with 3 arguments; for arrays they are
* (value, index, array) and for objects they are (value, key, object).
*
* @static
* @memberOf _
* @alias each
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} callback The function called per iteration.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Array|Object} Returns the `collection`.
* @example
*
* _.forEach([1, 2, 3], function(num) { alert(num); });
* // => alerts each number in turn...
*
* _.forEach({ 'one': 1, 'two': 2, 'three': 3}, function(num) { alert(num); });
* // => alerts each number in turn...
*/
var forEach = iterationFactory(forEachFactoryOptions);
/**
* Splits a `collection` into sets, grouped by the result of running each value
* through `callback`. The `callback` is invoked with 3 arguments; for arrays
* they are (value, index, array) and for objects they are (value, key, object).
* The `callback` argument may also be the name of a property to group by.
*
* @static
* @memberOf _
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function|String} callback The function called per iteration or
* property name to group by.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Object} Returns an object of grouped values.
* @example
*
* _.groupBy([1.3, 2.1, 2.4], function(num) { return Math.floor(num); });
* // => { '1': [1.3], '2': [2.1, 2.4] }
*
* _.groupBy(['one', 'two', 'three'], 'length');
* // => { '3': ['one', 'two'], '5': ['three'] }
*/
var groupBy = iterationFactory(forEachFactoryOptions, {
'init': '{}',
'top':
'var prop, isFunc = toString.call(callback) == funcClass;\n' +
'if (isFunc && thisArg) callback = bind(callback, thisArg)',
'inLoop':
'prop = isFunc' +
'? callback(collection[index], index, collection)' +
': collection[index][callback];\n' +
'(result[prop] || (result[prop] = [])).push(collection[index])'
});
/**
* Produces a new array of values by mapping each value in the `collection`
* through a transformation `callback`. The `callback` is bound to the `thisArg`
* value, if one is passed. The `callback` is invoked with 3 arguments; for
* arrays they are (value, index, array) and for objects they are (value, key, object).
*
* @static
* @memberOf _
* @alias collect
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} callback The function called per iteration.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Array} Returns a new array of values returned by the callback.
* @example
*
* _.map([1, 2, 3], function(num) { return num * 3; });
* // => [3, 6, 9]
*
* _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; });
* // => [3, 6, 9]
*/
var map = iterationFactory(forEachFactoryOptions, mapFactoryOptions);
/**
* Retrieves the maximum value of a `collection`. If `callback` is passed,
* it will be executed for each value in the `collection` to generate the
* criterion by which the value is ranked. The `callback` is invoked with 3
* arguments; for arrays they are (value, index, array) and for objects they
* are (value, key, object).
*
* @static
* @memberOf _
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} [callback] The function called per iteration.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Mixed} Returns the maximum value.
* @example
*
* var stooges = [
* { 'name': 'moe', 'age': 40 },
* { 'name': 'larry', 'age': 50 },
* { 'name': 'curly', 'age': 60 }
* ];
*
* _.max(stooges, function(stooge) { return stooge.age; });
* // => { 'name': 'curly', 'age': 60 };
*/
var max = iterationFactory(forEachFactoryOptions, maxFactoryOptions);
/**
* Retrieves the minimum value of a `collection`. If `callback` is passed,
* it will be executed for each value in the `collection` to generate the
* criterion by which the value is ranked. The `callback` is invoked with 3
* arguments; for arrays they are (value, index, array) and for objects they
* are (value, key, object).
*
* @static
* @memberOf _
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} [callback] The function called per iteration.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Mixed} Returns the minimum value.
* @example
*
* _.min([10, 5, 100, 2, 1000]);
* // => 2
*/
var min = iterationFactory(forEachFactoryOptions, maxFactoryOptions, {
'top': maxFactoryOptions.top.replace('-', '').replace('max', 'min'),
'inLoop': maxFactoryOptions.inLoop.replace('>=', '<')
});
/**
* Retrieves the value of a specified property from all values in a `collection`.
*
* @static
* @memberOf _
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {String} property The property to pluck.
* @returns {Array} Returns a new array of property values.
* @example
*
* var stooges = [
* { 'name': 'moe', 'age': 40 },
* { 'name': 'larry', 'age': 50 },
* { 'name': 'curly', 'age': 60 }
* ];
*
* _.pluck(stooges, 'name');
* // => ['moe', 'larry', 'curly']
*/
var pluck = iterationFactory(mapFactoryOptions, {
'args': 'collection, property',
'inLoop': {
'array': 'result[index] = collection[index][property]',
'object': 'result.push(collection[index][property])'
}
});
/**
* Boils down a `collection` to a single value. The initial state of the
* reduction is `accumulator` and each successive step of it should be returned
* by the `callback`. The `callback` is bound to the `thisArg` value, if one is
* passed. The `callback` is invoked with 4 arguments; for arrays they are
* (accumulator, value, index, array) and for objects they are
* (accumulator, value, key, object).
*
* @static
* @memberOf _
* @alias foldl, inject
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} callback The function called per iteration.
* @param {Mixed} [accumulator] Initial value of the accumulator.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Mixed} Returns the accumulated value.
* @example
*
* var sum = _.reduce([1, 2, 3], function(memo, num) { return memo + num; });
* // => 6
*/
var reduce = iterationFactory({
'args': 'collection, callback, accumulator, thisArg',
'init': 'accumulator',
'top':
'var noaccum = arguments.length < 3;\n' +
'if (thisArg) callback = bind(callback, thisArg)',
'beforeLoop': {
'array': 'if (noaccum) result = collection[++index]'
},
'inLoop': {
'array':
'result = callback(result, collection[index], index, collection)',
'object':
'result = noaccum\n' +
'? (noaccum = false, collection[index])\n' +
': callback(result, collection[index], index, collection)'
}
});
/**
* The right-associative version of `_.reduce`. The `callback` is bound to the
* `thisArg` value, if one is passed. The `callback` is invoked with 4 arguments;
* for arrays they are (accumulator, value, index, array) and for objects they
* are (accumulator, value, key, object).
*
* @static
* @memberOf _
* @alias foldr
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} callback The function called per iteration.
* @param {Mixed} [accumulator] Initial value of the accumulator.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Mixed} Returns the accumulated value.
* @example
*
* var list = [[0, 1], [2, 3], [4, 5]];
* var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
* // => [4, 5, 2, 3, 0, 1]
*/
function reduceRight(collection, callback, accumulator, thisArg) {
if (!collection) {
return accumulator;
}
var length = collection.length,
noaccum = arguments.length < 3;
if(thisArg) {
callback = bind(callback, thisArg);
}
if (length === +length) {
if (length && noaccum) {
accumulator = collection[--length];
}
while (length--) {
accumulator = callback(accumulator, collection[length], length, collection);
}
return accumulator;
}
var prop,
props = keys(collection);
length = props.length;
if (length && noaccum) {
accumulator = collection[props[--length]];
}
while (length--) {
prop = props[length];
accumulator = callback(accumulator, collection[prop], prop, collection);
}
return accumulator;
}
/**
* The opposite of `_.filter`, this method returns the values of a `collection`
* that `callback` does **not** return truthy for. The `callback` is invoked
* with 3 arguments; for arrays they are (value, index, array) and for objects
* they are (value, key, object).
*
* @static
* @memberOf _
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} callback The function called per iteration.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Array} Returns a new array of values that did **not** pass the callback check.
* @example
*
* var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
* // => [1, 3, 5]
*/
var reject = iterationFactory(forEachFactoryOptions, filterFactoryOptions, {
'inLoop': '!' + filterFactoryOptions.inLoop
});
/**
* Gets the number of values in the `collection`.
*
* @static
* @memberOf _
* @category Collections
* @param {Array|Object} collection The collection inspect.
* @returns {Number} Returns the number of values in the collection.
* @example
*
* _.size({ 'one': 1, 'two': 2, 'three': 3 });
* // => 3
*/
function size(collection) {
var className = toString.call(collection);
return className == arrayClass || className == stringClass
? collection.length
: keys(collection).length;
}
/**
* Produces a new sorted array, ranked in ascending order by the results of
* running each value of a `collection` through `callback`. The `callback` is
* invoked with 3 arguments; for arrays they are (value, index, array) and for
* objects they are (value, key, object). The `callback` argument may also be
* the name of a property to sort by (e.g. 'length').
*
* @static
* @memberOf _
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function|String} callback The function called per iteration or
* property name to sort by.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Array} Returns a new array of sorted values.
* @example
*
* _.sortBy([1, 2, 3, 4, 5, 6], function(num) { return Math.sin(num); });
* // => [5, 4, 6, 3, 1, 2]
*/
function sortBy(collection, callback, thisArg) {
if (toString.call(callback) != funcClass) {
var prop = callback;
callback = function(collection) { return collection[prop]; };
} else if (thisArg) {
callback = bind(callback, thisArg);
}
return pluck(map(collection, function(value, index) {
return {
'criteria': callback(value, index, collection),
'value': value
};
}).sort(function(left, right) {
var a = left.criteria,
b = right.criteria;
if (a === undefined) {
return 1;
}
if (b === undefined) {
return -1;
}
return a < b ? -1 : a > b ? 1 : 0;
}), 'value');
}
/**
* Checks if the `callback` returns a truthy value for **any** element of a
* `collection`. The function returns as soon as it finds passing value, and
* does not iterate over the entire `collection`. The `callback` is invoked
* with 3 arguments; for arrays they are (value, index, array) and for objects
* they are (value, key, object).
*
* @static
* @memberOf _
* @alias any
* @category Collections
* @param {Array|Object} collection The collection to iterate over.
* @param {Function} callback The function called per iteration.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @returns {Boolean} Returns `true` if any value passes the callback check, else `false`.
* @example
*
* _.some([null, 0, 'yes', false]);
* // => true
*/
var some = iterationFactory(forEachFactoryOptions, everyFactoryOptions, {
'init': 'false',
'inLoop': everyFactoryOptions.inLoop.replace('!', '')
});
/**
* Converts the `collection`, into an array. Useful for converting the
* `arguments` object.
*
* @static
* @memberOf _
* @category Collections
* @param {Array|Object} collection The collection to convert.
* @returns {Array} Returns the new converted array.
* @example
*
* (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
* // => [2, 3, 4]
*/
function toArray(collection) {
if (!collection) {
return [];
}
if (toString.call(collection.toArray) == funcClass) {
return collection.toArray();
}
var length = collection.length;
if (length === +length) {
return slice.call(collection);
}
return values(collection);
}
/**
* Produces an array of enumerable own property values of the `collection`.
*
* @static
* @memberOf _
* @alias methods
* @category Collections
* @param {Array|Object} collection The collection to inspect.
* @returns {Array} Returns a new array of property values.
* @example
*
* _.values({ 'one': 1, 'two': 2, 'three': 3 });
* // => [1, 2, 3]
*/
var values = iterationFactory(mapFactoryOptions, {
'args': 'collection',
'inLoop': {
'array': 'result[index] = collection[index]',
'object': 'result.push(collection[index])'
}
});
/*--------------------------------------------------------------------------*/
/**
* Produces a new array with all falsey values of `array` removed. The values
* `false`, `null`, `0`, `""`, `undefined` and `NaN` are all falsey.
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to compact.
* @returns {Array} Returns a new filtered array.
* @example
*
* _.compact([0, 1, false, 2, '', 3]);
* // => [1, 2, 3]
*/
var compact = function(array) {
var index = -1,
length = array.length,
result = [];
while (++index < length) {
if (array[index]) {
result.push(array[index]);
}
}
return result;
}
/**
* Produces a new array of `array` values not present in the other arrays
* using strict equality for comparisons, i.e. `===`.
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to process.
* @param {Mixed} [array1, array2, ...] Arrays to check.
* @returns {Array} Returns a new array of `array` values not present in the
* other arrays.
* @example
*
* _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
* // => [1, 3, 4]
*/
function difference(array) {
var index = -1,
length = array.length,
result = [],
flattened = concat.apply(result, slice.call(arguments, 1));
while (++index < length) {
if (indexOf(flattened, array[index]) < 0) {
result.push(array[index]);
}
}
return result;
}
/**
* Gets the first value of the `array`. Pass `n` to return the first `n` values
* of the `array`.
*
* @static
* @memberOf _
* @alias head, take
* @category Arrays
* @param {Array} array The array to query.
* @param {Number} [n] The number of elements to return.
* @param {Object} [guard] Internally used to allow this method to work with
* others like `_.map` without using their callback `index` argument for `n`.
* @returns {Mixed} Returns the first value or an array of the first `n` values
* of the `array`.
* @example
*
* _.first([5, 4, 3, 2, 1]);
* // => 5
*/
function first(array, n, guard) {
return (n == undefined || guard) ? array[0] : slice.call(array, 0, n);
}
/**
* Flattens a nested array (the nesting can be to any depth). If `shallow` is
* truthy, `array` will only be flattened a single level.
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to compact.
* @param {Boolean} shallow A flag to indicate only flattening a single level.
* @returns {Array} Returns a new flattened array.
* @example
*
* _.flatten([1, [2], [3, [[4]]]]);
* // => [1, 2, 3, 4];
*
* _.flatten([1, [2], [3, [[4]]]], true);
* // => [1, 2, 3, [[4]]];
*/
function flatten(array, shallow) {
if (shallow) {
return concat.apply(ArrayProto, array);
}
var value,
index = -1,
length = array.length,
result = [];
while (++index < length) {
value = array[index];
if (isArray(value)) {
push.apply(result, flatten(value));
} else {
result.push(value);
}
}
return result;
}
/**
* Gets the index at which the first occurrence of `value` is found using
* strict equality for comparisons, i.e. `===`. If the `array` is already
* sorted, passing `true` for `isSorted` will run a faster binary search.
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to search.
* @param {Mixed} value The value to search for.
* @param {Boolean} [isSorted=false] A flag to indicate that the `array` is already sorted.
* @returns {Number} Returns the index of the matched value or `-1`.
* @example
*
* _.indexOf([1, 2, 3], 2);
* // => 1
*/
function indexOf(array, value, isSorted) {
var index, length;
if (!array) {
return -1;
}
if (isSorted) {
index = sortedIndex(array, value);
return array[index] === value ? index : -1;
}
for (index = 0, length = array.length; index < length; index++) {
if (array[index] === value) {
return index;
}
}
return -1;
}
/**
* Gets all but the last value of the `array`. Pass `n` to exclude the last `n`
* values from the result.
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to query.
* @param {Number} [n] The number of elements to return.
* @param {Object} [guard] Internally used to allow this method to work with
* others like `_.map` without using their callback `index` argument for `n`.
* @returns {Array} Returns all but the last value or `n` values of the `array`.
* @example
*
* _.initial([5, 4, 3, 2, 1]);
* // => [5, 4, 3, 2]
*/
function initial(array, n, guard) {
return slice.call(array, 0, -((n == undefined || guard) ? 1 : n));
}
/**
* Computes the intersection of all the passed-in arrays.
*
* @static
* @memberOf _
* @alias intersect
* @category Arrays
* @param {Mixed} [array1, array2, ...] Arrays to process.
* @returns {Array} Returns a new array of unique values, in order, that are
* present in **all** of the arrays.
* @example
*
* _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
* // => [1, 2]
*/
function intersection(array) {
var value,
index = -1,
length = array.length,
others = slice.call(arguments, 1),
result = [];
while (++index < length) {
value = array[index];
if (indexOf(result, value) < 0 &&
every(others, function(other) { return indexOf(other, value) > -1; })) {
result.push(value);
}
}
return result;
}
/**
* Calls the method named by `methodName` for each value of the `collection`.
* Additional arguments will be passed to each invoked method.
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to iterate over.
* @param {String} methodName The name of the method to invoke.
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with.
* @returns {Array} Returns a new array of values returned from each invoked method.
* @example
*
* _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
* // => [[1, 5, 7], [1, 2, 3]]
*/
function invoke(array, methodName) {
var args = slice.call(arguments, 2),
index = -1,
length = array.length,
isFunc = toString.call(methodName) == funcClass,
result = [];
while (++index < length) {
result[index] = (isFunc ? methodName : array[index][methodName]).apply(array[index], args);
}
return result;
}
/**
* Gets the last value of the `array`. Pass `n` to return the lasy `n` values
* of the `array`.
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to query.
* @param {Number} [n] The number of elements to return.
* @param {Object} [guard] Internally used to allow this method to work with
* others like `_.map` without using their callback `index` argument for `n`.
* @returns {Array} Returns all but the last value or `n` values of the `array`.
* @example
*
* _.last([5, 4, 3, 2, 1]);
* // => 1
*/
function last(array, n, guard) {
var length = array.length;
return (n == undefined || guard) ? array[length - 1] : slice.call(array, -n || length);
}
/**
* Gets the index at which the last occurrence of `value` is found using
* strict equality for comparisons, i.e. `===`.
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to search.
* @param {Mixed} value The value to search for.
* @returns {Number} Returns the index of the matched value or `-1`.
* @example
*
* _.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
* // => 4
*/
function lastIndexOf(array, value) {
if (!array) {
return -1;
}
var index = array.length;
while (index--) {
if (array[index] === value) {
return index;
}
}
return -1;
}
/**
* Creates an array of numbers (positive and/or negative) progressing from
* `start` up to but not including `stop`. This method is a port of Python's
* `range()` function. See http://docs.python.org/library/functions.html#range.
*
* @static
* @memberOf _
* @category Arrays
* @param {Number} [start=0] The start of the range.
* @param {Number} end The end of the range.
* @param {Number} [step=1] The value to increment or descrement by.
* @returns {Array} Returns a new range array.
* @example
*
* _.range(10);
* // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
*
* _.range(1, 11);
* // => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
*
* _.range(0, 30, 5);
* // => [0, 5, 10, 15, 20, 25]
*
* _.range(0, -10, -1);
* // => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
*
* _.range(0);
* // => []
*/
function range(start, end, step) {
step || (step = 1);
if (arguments.length < 2) {
end = start || 0;
start = 0;
}
var index = -1,
length = Math.max(Math.ceil((end - start) / step), 0),
result = Array(length);
while (++index < length) {
result[index] = start;
start += step;
}
return result;
}
/**
* The opposite of `_.initial`, this method gets all but the first value of
* the `array`. Pass `n` to exclude the first `n` values from the result.
*
* @static
* @memberOf _
* @alias tail
* @category Arrays
* @param {Array} array The array to query.
* @param {Number} [n] The number of elements to return.
* @param {Object} [guard] Internally used to allow this method to work with
* others like `_.map` without using their callback `index` argument for `n`.
* @returns {Array} Returns all but the first value or `n` values of the `array`.
* @example
*
* _.rest([5, 4, 3, 2, 1]);
* // => [4, 3, 2, 1]
*/
function rest(array, n, guard) {
return slice.call(array, (n == undefined || guard) ? 1 : n);
}
/**
* Produces a new array of shuffled `array` values, using a version of the
* Fisher-Yates shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle.
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to shuffle.
* @returns {Array} Returns a new shuffled array.
* @example
*
* _.shuffle([1, 2, 3, 4, 5, 6]);
* // => [4, 1, 6, 3, 5, 2]
*/
function shuffle(array) {
var rand,
index = -1,
length = array.length,
result = Array(length);
while (++index < length) {
rand = Math.floor(Math.random() * (index + 1));
result[index] = result[rand];
result[rand] = array[index];
}
return result;
}
/**
* Uses a binary search to determine the smallest index at which the `value`
* should be inserted into the `collection` in order to maintain the sort order
* of the `collection`. If `callback` is passed, it will be executed for each
* value in the `collection` to compute their sort ranking. The `callback` is
* invoked with 1 argument; (value).
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to iterate over.
* @param {Mixed} value The value to evaluate.
* @param {Function} [callback] The function called per iteration.
* @returns {Number} Returns the index at which the value should be inserted
* into the collection.
* @example
*
* _.sortedIndex([10, 20, 30, 40, 50], 35);
* // => 3
*/
function sortedIndex(array, value, callback) {
var mid,
low = 0,
high = array.length;
if (callback) {
value = callback(value);
}
while (low < high) {
mid = (low + high) >> 1;
if ((callback ? callback(array[mid]) : array[mid]) < value) {
low = mid + 1;
} else {
high = mid;
}
}
return low;
}
/**
* Computes the union of the passed-in arrays.
*
* @static
* @memberOf _
* @category Arrays
* @param {Mixed} [array1, array2, ...] Arrays to process.
* @returns {Array} Returns a new array of unique values, in order, that are
* present in one or more of the arrays.
* @example
*
* _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
* // => [1, 2, 3, 101, 10]
*/
function union() {
var index = -1,
result = [],
flattened = concat.apply(result, arguments),
length = flattened.length;
while (++index < length) {
if (indexOf(result, flattened[index]) < 0) {
result.push(flattened[index]);
}
}
return result;
}
/**
* Produces a duplicate-value-free version of the `array` using strict equality
* for comparisons, i.e. `===`. If the `array` is already sorted, passing `true`
* for `isSorted` will run a faster algorithm. If `callback` is passed,
* each value of `array` is passed through a transformation `callback` before
* uniqueness is computed. The `callback` is invoked with 3 arguments;
* (value, index, array).
*
* @static
* @memberOf _
* @alias unique
* @category Arrays
* @param {Array} array The array to process.
* @param {Boolean} [isSorted=false] A flag to indicate that the `array` is already sorted.
* @param {Function} [callback] A
* @returns {Array} Returns a duplicate-value-free array.
* @example
*
* _.uniq([1, 2, 1, 3, 1, 4]);
* // => [1, 2, 3, 4]
*/
function uniq(array, isSorted, callback) {
var computed,
index = -1,
length = array.length,
result = [],
seen = [];
if (length < 3) {
isSorted = true;
}
while (++index < length) {
computed = callback ? callback(array[index]) : array[index];
if (isSorted
? !index || seen[seen.length - 1] !== computed
: indexOf(seen, computed) < 0
) {
seen.push(computed);
result.push(array[index]);
}
}
return result;
}
/**
* Produces a new array with all occurrences of the values removed using strict
* equality for comparisons, i.e. `===`.
*
* @static
* @memberOf _
* @category Arrays
* @param {Array} array The array to filter.
* @param {Mixed} [value1, value2, ...] Values to remove.
* @returns {Array} Returns a new filtered array.
* @example
*
* _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
* // => [2, 3, 4]
*/
function without(array) {
var excluded = slice.call(arguments, 1),
index = -1,
length = array.length,
result = [];
while (++index < length) {
if (indexOf(excluded, array[index]) < 0) {
result.push(array[index]);
}
}
return result;
}
/**
* Merges together the values of each of the arrays with the value at the
* corresponding position. Useful for separate data sources that are coordinated
* through matching array indexes. For a matrix of nested arrays, `_.zip.apply(...)`
* can transpose the matrix in a similar fashion.
*
* @static
* @memberOf _
* @category Arrays
* @param {Mixed} [array1, array2, ...] Arrays to process.
* @returns {Array} Returns a new array of merged arrays.
* @example
*
* _.zip(['moe', 'larry', 'curly'], [30, 40, 50], [true, false, false]);
* // => [['moe', 30, true], ['larry', 40, false], ['curly', 50, false]]
*/
function zip() {
var index = -1,
length = max(pluck(arguments, 'length')),
result = Array(length);
while (++index < length) {
result[index] = pluck(arguments, index);
}
return result;
}
/*--------------------------------------------------------------------------*/
/**
* Creates a new function that is restricted to executing only after it is
* called a given number of `times`.
*
* @static
* @memberOf _
* @category Functions
* @param {Number} times The number of times the function must be called before
* it is executed.
* @param {Function} func The function to restrict.
* @returns {Function} Returns the new restricted function.
* @example
*
* var renderNotes = _.after(notes.length, render);
* _.forEach(notes, function(note) {
* note.asyncSave({ 'success': renderNotes });
* });
* // renderNotes is run once, after all notes have saved.
*/
function after(times, func) {
if (times < 1) {
return func();
}
return function() {
if (--times < 1) {
return func.apply(this, arguments);
}
};
}
/**
* Creates a new function that, when called, invokes `func` with the `this`
* binding of `thisArg` and prepends additional arguments to those passed to
* the bound function. Lazy defined methods may be bound by passing the object
* they are bound to as `func` and the method name as `thisArg`.
*
* @static
* @memberOf _
* @category Functions
* @param {Function|Object} func The function to bind or the object the method belongs to.
* @param @param {Mixed} [thisArg] The `this` binding of `func` or the method name.
* @param {Mixed} [arg1, arg2, ...] Arguments to prepend to those passed to the bound function.
* @returns {Function} Returns the new bound function.
* @example
*
* // basic bind
* var func = function(greeting) { return greeting + ': ' + this.name; };
* func = _.bind(func, { 'name': 'moe' }, 'hi');
* func();
* // => 'hi: moe'
*
* // lazy bind
* var object = {
* 'name': 'moe',
* 'greet': function(greeting) {
* return greeting + ': ' + this.name;
* }
* };
*
* var func = _.bind(object, 'greet', 'hi');
* func();
* // => 'hi: moe'
*
* object.greet = function(greeting) {
* return greeting + ' ' + this.name + '!';
* };
*
* func();
* // => 'hi moe!'
*/
function bind(func, thisArg) {
var args = slice.call(arguments, 2),
argsLength = args.length,
isFunc = toString.call(func) == funcClass;
// juggle arguments
if (!isFunc) {
var methodName = thisArg;
thisArg = func;
}
return function() {
push.apply(args, arguments);
var result = (isFunc ? func : thisArg[methodName]).apply(thisArg, args);
args.length = argsLength;
return result;
};
}
/**
* Binds methods on the `object` to the object, overwriting the non-bound method.
* If no method names are provided, all the function properties of the `object`
* will be bound.
*
* @static
* @memberOf _
* @category Functions
* @param {Object} object The object to bind and assign the bound methods to.
* @param {Mixed} [methodName1, methodName2, ...] Method names on the object to bind.
* @returns {Object} Returns the `object`.
* @example
*
* var buttonView = {
* 'label': 'lodash',
* 'onClick': function() { alert('clicked: ' + this.label); },
* 'onHover': function() { console.log('hovering: ' + this.label); }
* };
*
* _.bindAll(buttonView);
* jQuery('#lodash_button').on('click', buttonView.onClick);
* // => When the button is clicked, `this.label` will have the correct value
*/
function bindAll(object) {
var funcs = arguments,
index = 1;
if (funcs.length == 1) {
index = 0;
funcs = functions(object);
}
for (var length = funcs.length; index < length; index++) {
object[funcs[index]] = bind(object[funcs[index]], object);
}
return object;
}
/**
* Creates a new function that is the composition of the passed functions,
* where each function consumes the return value of the function that follows.
* In math terms, composing thefunctions `f()`, `g()`, and `h()` produces `f(g(h()))`.
*
* @static
* @memberOf _
* @category Functions
* @param {Mixed} [func1, func2, ...] Functions to compose.
* @returns {Function} Returns the new composed function.
* @example
*
* var greet = function(name) { return 'hi: ' + name; };
* var exclaim = function(statement) { return statement + '!'; };
* var welcome = _.compose(exclaim, greet);
* welcome('moe');
* // => 'hi: moe!'
*/
function compose() {
var funcs = arguments;
return function() {
var args = arguments,
length = funcs.length;
while (length--) {
args = [funcs[length].apply(this, args)];
}
return args[0];
};
}
/**
* Creates a new function that will delay the execution of `func` until after
* `wait` milliseconds have elapsed since the last time it was invoked. Pass
* `true` for `immediate` to cause debounce to invoke `func` on the leading,
* instead of the trailing, edge of the `wait` timeout.
*
* @static
* @memberOf _
* @category Functions
* @param {Function} func The function to debounce.
* @param {Number} wait The number of milliseconds to delay.
* @param {Boolean} immediate A flag to indicate execution is on the leading
* edge of the timeout.
* @returns {Function} Returns the new debounced function.
* @example
*
* var lazyLayout = _.debounce(calculateLayout, 300);
* jQuery(window).on('resize', lazyLayout);
*/
function debounce(func, wait, immediate) {
var args,
result,
thisArg,
timeoutId;
function delayed() {
timeoutId = undefined;
if (!immediate) {
func.apply(thisArg, args);
}
}
return function() {
var isImmediate = immediate && !timeoutId;
args = arguments;
thisArg = this;
clearTimeout(timeoutId);
timeoutId = setTimeout(delayed, wait);
if (isImmediate) {
result = func.apply(thisArg, args);
}
return result;
};
}
/**
* Executes the `func` function after `wait` milliseconds. Additional arguments
* are passed to `func` when it is invoked.
*
* @static
* @memberOf _
* @category Functions
* @param {Function} func The function to delay.
* @param {Number} wait The number of milliseconds to delay execution.
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with.
* @returns {Number} Returns the `setTimeout` timeout id.
* @example
*
* var log = _.bind(console.log, console);
* _.delay(log, 1000, 'logged later');
* // => 'logged later' (Appears after one second.)
*/
function delay(func, wait) {
var args = slice.call(arguments, 2);
return setTimeout(function() { return func.apply(undefined, args); }, wait);
}
/**
* Defers executing the `func` function until the current call stack has cleared.
* Additional arguments are passed to `func` when it is invoked.
*
* @static
* @memberOf _
* @category Functions
* @param {Function} func The function to defer.
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with.
* @returns {Number} Returns the `setTimeout` timeout id.
* @example
*
* _.defer(function() { alert('deferred'); });
* // Returns from the function before the alert runs.
*/
function defer(func) {
var args = slice.call(arguments, 1);
return setTimeout(function() { return func.apply(undefined, args); }, 1);
}
/**
* Creates a new function that memoizes the result of `func`. If `resolver` is
* passed, it will be used to determine the cache key for storing the result
* based on the arguments passed to the memoized function. By default, the first
* argument passed to the memoized function is used as the cache key.
*
* @static
* @memberOf _
* @category Functions
* @param {Function} func The function to have its output memoized.
* @param {Function} [resolver] A function used to resolve the cache key.
* @returns {Function} Returns the new memoizing function.
* @example
*
* var fibonacci = _.memoize(function(n) {
* return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2);
* });
*/
function memoize(func, resolver) {
var cache = {};
return function() {
var prop = resolver ? resolver.apply(this, arguments) : arguments[0];
return hasOwnProperty.call(cache, prop)
? cache[prop]
: (cache[prop] = func.apply(this, arguments));
};
}
/**
* Creates a new function that is restricted to one execution. Repeat calls to
* the function will return the value of the first call.
*
* @static
* @memberOf _
* @category Functions
* @param {Function} func The function to restrict.
* @returns {Function} Returns the new restricted function.
* @example
*
* var initialize = _.once(createApplication);
* initialize();
* initialize();
* // Application is only created once.
*/
function once(func) {
var result,
ran = false;
return function() {
if (ran) {
return result;
}
ran = true;
result = func.apply(this, arguments);
return result;
};
}
/**
* Creates a new function that, when executed, will only call the `func`
* function at most once per every `wait` milliseconds. If the throttled function
* is invoked more than once, `func` will also be called on the trailing edge
* of the `wait` timeout.
*
* @static
* @memberOf _
* @category Functions
* @param {Function} func The function to throttle.
* @param {Number} wait The number of milliseconds to throttle executions to.
* @returns {Function} Returns the new throttled function.
* @example
*
* var throttled = _.throttle(updatePosition, 100);
* jQuery(window).on('scroll', throttled);
*/
function throttle(func, wait) {
var args,
result,
thisArg,
timeoutId,
lastCalled = 0;
function trailingCall() {
lastCalled = new Date;
timeoutId = undefined;
func.apply(thisArg, args);
}
return function() {
var now = new Date,
remain = wait - (now - lastCalled);
args = arguments;
thisArg = this;
if (remain <= 0) {
lastCalled = now;
result = func.apply(thisArg, args);
}
else if (!timeoutId) {
timeoutId = setTimeout(trailingCall, remain);
}
return result;
};
}
/**
* Create a new function that passes the `func` function to the `wrapper`
* function as its first argument. Additional arguments are appended to those
* passed to the `wrapper` function.
*
* @static
* @memberOf _
* @category Functions
* @param {Function} func The function to wrap.
* @param {Function} wrapper The wrapper function.
* @param {Mixed} [arg1, arg2, ...] Arguments to append to those passed to the wrapper.
* @returns {Function} Returns the new function.
* @example
*
* var hello = function(name) { return 'hello: ' + name; };
* hello = _.wrap(hello, function(func) {
* return 'before, ' + func('moe') + ', after';
* });
* hello();
* // => 'before, hello: moe, after'
*/
function wrap(func, wrapper) {
return function() {
var args = [func];
push.apply(args, arguments);
return wrapper.apply(this, args);
};
}
/*--------------------------------------------------------------------------*/
/**
* Create a shallow clone of the `value`. Any nested objects or arrays will be
* assigned by reference and not cloned.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to clone.
* @returns {Mixed} Returns the cloned `value`.
* @example
*
* _.clone({ 'name': 'moe' });
* // => { 'name': 'moe' };
*/
function clone(value) {
if (value !== Object(value)) {
return value;
}
return isArray(value) ? value.slice() : extend({}, value);
}
/**
* Assigns missing properties in `object` with default values from the defaults
* objects. As soon as a property is set, additional defaults of the same
* property will be ignored.
*
* @static
* @memberOf _
* @category Objects
* @param {Object} object The object to populate.
* @param {Object} [defaults1, defaults2, ..] The defaults objects to apply to `object`.
* @returns {Object} Returns `object`.
* @example
*
* var iceCream = { 'flavor': 'chocolate' };
* _.defaults(iceCream, { 'flavor': 'vanilla', 'sprinkles': 'lots' });
* // => { 'flavor': 'chocolate', 'sprinkles': 'lots' }
*/
var defaults = iterationFactory(extendFactoryOptions, {
'inLoop': 'if (object[index] == undefined)' + extendFactoryOptions.inLoop
});
/**
* Copies enumerable properties from the source objects to the `destination` object.
* Subsequent sources will overwrite propery assignments of previous sources.
*
* @static
* @memberOf _
* @category Objects
* @param {Object} object The destination object.
* @param {Object} [source1, source2, ..] The source objects.
* @returns {Object} Returns the destination object.
* @example
*
* _.extend({ 'name': 'moe' }, { 'age': 40 });
* // => { 'name': 'moe', 'age': 40 }
*/
var extend = iterationFactory(extendFactoryOptions);
/**
* Produces a sorted array of the properties, own and inherited, of `object`
* that have function values.
*
* @static
* @memberOf _
* @alias methods
* @category Objects
* @param {Object} object The object to inspect.
* @returns {Array} Returns a new array of property names that have function values.
* @example
*
* _.functions(_);
* // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
*/
var functions = iterationFactory({
'args': 'object',
'init': '[]',
'useHas': false,
'inLoop': 'if (toString.call(object[index]) == funcClass) result.push(index)',
'bottom': 'result.sort()'
});
/**
* Checks if the specified object `property` exists and is a direct property,
* instead of an inherited property.
*
* @static
* @memberOf _
* @category Objects
* @param {Object} object The object to check.
* @param {String} property The property to check for.
* @returns {Boolean} Returns `true` if key is a direct property, else `false`.
* @example
*
* _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b');
* // => true
*/
function has(object, property) {
return hasOwnProperty.call(object, property);
}
/**
* Checks if a `value` is an `arguments` object.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is an `arguments` object, else `false`.
* @example
*
* (function() { return _.isArguments(arguments); })(1, 2, 3);
* // => true
*
* _.isArguments([1, 2, 3]);
* // => false
*/
var isArguments = function isArguments(value) {
return toString.call(value) == '[object Arguments]';
};
// fallback for browser like IE<9 which detect `arguments` as `[object Object]`
if (!isArguments(arguments)) {
isArguments = function(value) {
return !!(value && hasOwnProperty.call(value, 'callee'));
};
}
/**
* Checks if a `value` is a boolean (`true` or `false`) value.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is a boolean value, else `false`.
* @example
*
* _.isBoolean(null);
* // => false
*/
function isBoolean(value) {
return value === true || value === false || toString.call(value) == boolClass;
}
/**
* Checks if a `value` is a date.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is a date, else `false`.
* @example
*
* _.isDate(new Date);
* // => true
*/
function isDate(value) {
return toString.call(value) == dateClass;
}
/**
* Checks if a `value` is a DOM element.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is a DOM element, else `false`.
* @example
*
* _.isElement(document.body);
* // => true
*/
function isElement(value) {
return !!(value && value.nodeType == 1);
}
/**
* Performs a deep comparison between two values to determine if they are
* equivalent to each other.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} a The value to compare.
* @param {Mixed} b The other value to compare.
* @param {Array} [stack] Internally used to keep track of "seen" objects to
* avoid circular references.
* @returns {Boolean} Returns `true` if the values are equvalent, else `false`.
* @example
*
* var moe = { 'name': 'moe', 'luckyNumbers': [13, 27, 34] };
* var clone = { 'name': 'moe', 'luckyNumbers': [13, 27, 34] };
*
* moe == clone;
* // => false
*
* _.isEqual(moe, clone);
* // => true
*/
function isEqual(a, b, stack) {
stack || (stack = []);
// exit early for identical values
if (a === b) {
// treat `+0` vs. `-0` as not equal
return a !== 0 || (1 / a == 1 / b);
}
// a strict comparison is necessary because `null == undefined`
if (a == undefined || b == undefined) {
return a === b;
}
// unwrap any wrapped objects
if (a._chain) {
a = a._wrapped;
}
if (b._chain) {
b = b._wrapped;
}
// invoke a custom `isEqual` method if one is provided
if (a.isEqual && toString.call(a.isEqual) == funcClass) {
return a.isEqual(b);
}
if (b.isEqual && toString.call(b.isEqual) == funcClass) {
return b.isEqual(a);
}
// compare [[Class]] names
var className = toString.call(a);
if (className != toString.call(b)) {
return false;
}
switch (className) {
// strings, numbers, dates, and booleans are compared by value
case stringClass:
// primitives and their corresponding object instances are equivalent;
// thus, `'5'` is quivalent to `new String('5')`
return a == String(b);
case numberClass:
// treat `NaN` vs. `NaN` as equal
return a != +a
? b != +b
// but treat `+0` vs. `-0` as not equal
: (a == 0 ? (1 / a == 1 / b) : a == +b);
case boolClass:
case dateClass:
// coerce dates and booleans to numeric values, dates to milliseconds and booleans to 1 or 0;
// treat invalid dates coerced to `NaN` as not equal
return +a == +b;
// regexps are compared by their source and flags
case regexpClass:
return a.source == b.source &&
a.global == b.global &&
a.multiline == b.multiline &&
a.ignoreCase == b.ignoreCase;
}
if (typeof a != 'object' || typeof b != 'object') {
return false;
}
// Assume equality for cyclic structures. The algorithm for detecting cyclic
// structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
var length = stack.length;
while (length--) {
// Linear search. Performance is inversely proportional to the number of
// unique nested structures.
if (stack[length] == a) {
return true;
}
}
var result = true,
size = 0;
// add the first collection to the stack of traversed objects
stack.push(a);
// recursively compare objects and arrays
if (className == arrayClass) {
// compare array lengths to determine if a deep comparison is necessary
size = a.length;
result = size == b.length;
if (result) {
// deep compare the contents, ignoring non-numeric properties
while (size--) {
// ensure commutative equality for sparse arrays
if (!(result = size in a == size in b && isEqual(a[size], b[size], stack))) {
break;
}
}
}
} else {
// objects with different constructors are not equivalent
if ('constructor' in a != 'constructor' in b || a.constructor != b.constructor) {
return false;
}
// deep compare objects
for (var prop in a) {
if (hasOwnProperty.call(a, prop)) {
// count the expected number of properties
size++;
// deep compare each member
if (!(result = hasOwnProperty.call(b, prop) && isEqual(a[prop], b[prop], stack))) {
break;
}
}
}
// ensure that both objects contain the same number of properties
if (result) {
for (prop in b) {
if (hasOwnProperty.call(b, prop) && !(size--)) {
break;
}
}
result = !size;
}
}
// remove the first collection from the stack of traversed objects
stack.pop();
return result;
}
/**
* Checks if a `value` is a finite number.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is a finite number, else `false`.
* @example
*
* _.isFinite(-101);
* // => true
*
* _.isFinite('10');
* // => false
*
* _.isFinite(Infinity);
* // => false
*/
function isFinite(value) {
return nativeIsFinite(value) && toString.call(value) == numberClass;
}
/**
* Checks if a `value` is a function.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is a function, else `false`.
* @example
*
* _.isFunction(''.concat);
* // => true
*/
function isFunction(value) {
return toString.call(value) == funcClass;
}
/**
* Checks if a `value` is an object.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is an object, else `false`.
* @example
*
* _.isObject({});
* // => true
*
* _.isObject(1);
* // => false
*/
function isObject(value) {
return value === Object(value);
}
/**
* Checks if a `value` is `NaN`.
* Note: this is not the same as native `isNaN`, which will return true for
* `undefined` and other values. See http://es5.github.com/#x15.1.2.4.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is `NaN`, else `false`.
* @example
*
* _.isNaN(NaN);
* // => true
*
* _.isNaN(new Number(NaN));
* // => true
*
* isNaN(undefined);
* // => true
*
* _.isNaN(undefined);
* // => false
*/
function isNaN(value) {
// `NaN` as a primitive is the only value that is not equal to itself
// (perform the [[Class]] check first to avoid errors with some host objects in IE)
return toString.call(value) == numberClass && value != +value
}
/**
* Checks if a `value` is `null`.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is `null`, else `false`.
* @example
*
* _.isNull(null);
* // => true
*
* _.isNull(undefined);
* // => false
*/
function isNull(value) {
return value === null;
}
/**
* Checks if a `value` is a number.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is a number, else `false`.
* @example
*
* _.isNumber(8.4 * 5;
* // => true
*/
function isNumber(value) {
return toString.call(value) == numberClass;
}
/**
* Checks if a `value` is a regular expression.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is a regular expression, else `false`.
* @example
*
* _.isRegExp(/moe/);
* // => true
*/
function isRegExp(value) {
return toString.call(value) == regexpClass;
}
/**
* Checks if a `value` is a string.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is a string, else `false`.
* @example
*
* _.isString('moe');
* // => true
*/
function isString(value) {
return toString.call(value) == stringClass;
}
/**
* Checks if a `value` is `undefined`.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to check.
* @returns {Boolean} Returns `true` if the `value` is `undefined`, else `false`.
* @example
*
* _.isUndefined(void 0);
* // => true
*/
function isUndefined(value) {
return value === undefined;
}
/**
* Produces an array of the `object`'s enumerable own property names.
*
* @static
* @memberOf _
* @category Objects
* @param {Object} object The object to inspect.
* @returns {Array} Returns a new array of property names.
* @example
*
* _.keys({ 'one': 1, 'two': 2, 'three': 3 });
* // => ['one', 'two', 'three']
*/
var keys = nativeKeys || iterationFactory({
'args': 'object',
'exit': 'if (object !== Object(object)) throw TypeError()',
'init': '[]',
'inLoop': 'result.push(index)'
});
/**
* Creates an object composed of the specified properties. Property names may
* be specified as individual arguments or as arrays of property names.
*
* @static
* @memberOf _
* @category Objects
* @param {Object} object The object to pluck.
* @param {Object} [prop1, prop2, ..] The properties to pick.
* @returns {Object} Returns an object composed of the picked properties.
* @example
*
* _.pick({ 'name': 'moe', 'age': 40, 'userid': 'moe1' }, 'name', 'age');
* // => { 'name': 'moe', 'age': 40 }
*/
function pick(object) {
var prop,
index = 0,
props = concat.apply(ArrayProto, arguments),
length = props.length,
result = {};
// start `index` at `1` to skip `object`
while (++index < length) {
prop = props[index];
if (prop in object) {
result[prop] = object[prop];
}
}
return result;
}
/**
* Invokes `interceptor` with the `value` as the first argument, and then returns
* `value`. The primary purpose of this method is to "tap into" a method chain,
* in order to performoperations on intermediate results within the chain.
*
* @static
* @memberOf _
* @category Objects
* @param {Mixed} value The value to pass to `callback`.
* @param {Function} interceptor The function to invoke.
* @returns {Mixed} Returns `value`.
* @example
*
* _.chain([1,2,3,200])
* .filter(function(num) { return num % 2 == 0; })
* .tap(alert)
* .map(function(num) { return num * num })
* .value();
* // => // [2, 200] (alerted)
* // => [4, 40000]
*/
function tap(value, interceptor) {
interceptor(value);
return value;
}
/*--------------------------------------------------------------------------*/
/**
* Escapes a string for insertion into HTML, replacing `&`, `<`, `"`, `'`,
* and `/` characters.
*
* @static
* @memberOf _
* @category Utilities
* @param {String} string The string to escape.
* @returns {String} Returns the escaped string.
* @example
*
* _.escape('Curly, Larry & Moe');
* // => "Curly, Larry & Moe"
*/
function escape(string) {
return (string + '')
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/"/g, '"')
.replace(/'/g, ''')
.replace(/\//g,'/');
}
/**
* This function simply returns the first argument passed to it.
* Note: It is used throughout Lo-Dash as a default callback.
*
* @static
* @memberOf _
* @category Utilities
* @param {Mixed} value Any value.
* @returns {Mixed} Returns `value`.
* @example
*
* var moe = { 'name': 'moe' };
* moe === _.identity(moe);
* // => true
*/
function identity(value) {
return value;
}
/**
* Adds functions properties of `object` to the `lodash` function and chainable
* wrapper.
*
* @static
* @memberOf _
* @category Utilities
* @param {Object} object The object of function properties to add to `lodash`.
* @example
*
* _.mixin({
* 'capitalize': function(string) {
* return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase();
* }
* });
*
* _.capitalize('curly');
* // => 'Curly'
*
* _('larry').capitalize();
* // => 'Larry'
*/
function mixin(object) {
forEach(functions(object), function(methodName) {
var func = lodash[methodName] = object[methodName];
lodash.prototype[methodName] = function() {
var args = [this._wrapped];
push.apply(args, arguments);
var result = func.apply(lodash, args);
return this._chain ? new Lodash(result).chain() : result;
};
});
}
/**
* Reverts the '_' variable to its previous value and returns a reference to
* the `lodash` function.
*
* @static
* @memberOf _
* @category Utilities
* @returns {Function} Returns the `lodash` function.
* @example
*
* var lodash = _.noConflict();
*/
function noConflict() {
window._ = oldDash;
return this;
}
/**
* Resolves the value of `property` on `object`. If the property is a function
* it will be invoked and its result returned, else the property value is returned.
*
* @static
* @memberOf _
* @category Utilities
* @param {Object} object The object to inspect.
* @param {String} property The property to get the result of.
* @returns {Mixed} Returns the resolved.
* @example
*
* var object = {
* 'cheese': 'crumpets',
* 'stuff': function() {
* return 'nonsense';
* }
* };
*
* _.result(object, 'cheese');
* // => 'crumpets'
*
* _.result(object, 'stuff');
* // => 'nonsense'
*/
function result(object, property) {
if (!object) {
return null;
}
var value = object[property];
return toString.call(value) == funcClass ? object[property]() : value;
}
/**
* A JavaScript micro-templating method, similar to John Resig's implementation.
* Lo-Dash templating handles arbitrary delimiters, preserves whitespace, and
* correctly escapes quotes within interpolated code.
*
* @static
* @memberOf _
* @category Utilities
* @param {String} text The template text.
* @param {Obect} data The data object used to populate the text.
* @param {Object} options The options object.
* @returns {Function|String} Returns a compiled function when no `data` object
* is given, else it returns the interpolated text.
* @example
*
* // using compiled template
* var compiled = _.template('hello: <%= name %>');
* compiled({ 'name': 'moe' });
* // => 'hello: moe'
*
* var list = '% _.forEach(people, function(name) { %> <li><%= name %></li> <% }); %>';
* _.template(list, { 'people': ['moe', 'curly', 'larry'] });
* // => '<li>moe</li><li>curly</li><li>larry</li>'
*
* var template = _.template('<b><%- value %></b>');
* template({ 'value': '<script>' });
* // => '<b><script></b>'
*
* // using `print`
* var compiled = _.template('<% print("Hello " + epithet); %>');
* compiled({ 'epithet': 'stooge' });
* // => 'Hello stooge.'
*
* // using custom template settings
* _.templateSettings = {
* 'interpolate': /\{\{(.+?)\}\}/g
* };
*
* var template = _.template('Hello {{ name }}!');
* template({ 'name': 'Mustache' });
* // => 'Hello Mustache!'
*
*
* // using the `variable` option
* _.template('<%= data.hasWith %>', { 'hasWith': 'no' }, { 'variable': 'data' });
* // => 'no'
*
* // using the `source` property
* <script>
* JST.project = <%= _.template(jstText).source %>;
* </script>
*/
function template(text, data, options) {
options = defaults(options || {}, lodash.templateSettings);
var result,
reEscapeDelimiter = options.escape,
reEvaluateDelimiter = options.evaluate,
reInterpolateDelimiter = options.interpolate,
variable = options.variable;
// tokenize delimiters to avoid escaping them
if (reEscapeDelimiter) {
text = text.replace(reEscapeDelimiter, tokenizeEscape);
}
if (reInterpolateDelimiter) {
text = text.replace(reInterpolateDelimiter, tokenizeInterpolate);
}
if (reEvaluateDelimiter) {
text = text.replace(reEvaluateDelimiter, tokenizeEvaluate);
}
// escape characters that cannot be included in string literals and
// detokenize delimiter code snippets
text = "__p='" + text.replace(reUnescaped, escapeChar).replace(reToken, detokenize) + "';\n";
// clear stored code snippets
tokenized.length = 0;
// if `options.variable` is not specified, add `data` to the top of the scope chain
if (!variable) {
text = 'with (object || {}) {\n' + text + '\n}\n';
}
text = 'function(' + (variable || 'object') + ') {\n' +
'var __p, __t;\n' +
'function print() { __p += __j.call(arguments, "") }\n' +
text +
'return __p\n}';
result = Function('_, __e, __j', 'return ' + text)(lodash, escape, join);
if (data) {
return result(data);
}
// provide the compiled function's source via its `toString()` method, in
// supported environments, or the `source` property as a convenience for
// build time precompilation
result.source = text;
return result;
}
/**
* Executes the `callback` function `n` times. The `callback` is invoked with
* 1 argument; (index).
*
* @static
* @memberOf _
* @category Utilities
* @param {Number} n The number of times to execute the callback.
* @param {Function} callback The function called per iteration.
* @param {Mixed} [thisArg] The `this` binding for the callback.
* @example
*
* _.times(3, function() { genie.grantWish(); });
*/
function times(n, callback, thisArg) {
if (thisArg) {
callback = bind(callback, thisArg);
}
for (var index = 0; index < n; index++) {
callback(index);
}
}
/**
* Generates a unique id. If `prefix` is passed, the id will be appended to it.
*
* @static
* @memberOf _
* @category Utilities
* @param {String} [prefix] The value to prefix the id with.
* @returns {Number|String} Returns a numeric id if no prefix is passed, else
* a string id may be returned.
* @example
*
* _.uniqueId('contact_');
* // => 'contact_104'
*/
function uniqueId(prefix) {
var id = idCounter++;
return prefix ? prefix + id : id;
}
/*--------------------------------------------------------------------------*/
/**
* Wraps the value in a `lodash` chainable object.
*
* @static
* @memberOf _
* @category Chaining
* @param {Mixed} value The value to wrap.
* @returns {Object} Returns the `lodash` chainable object.
* @example
*
* var stooges = [
* { 'name': 'moe', 'age': 40 },
* { 'name': 'larry', 'age': 50 },
* { 'name': 'curly', 'age': 60 }
* ];
*
* var youngest = _.chain(stooges)
* .sortBy(function(stooge) { return stooge.age; })
* .map(function(stooge) { return stooge.name + ' is ' + stooge.age; })
* .first()
* .value();
* // => 'moe is 40'
*/
function chain(value) {
return new Lodash(value).chain();
}
/**
* Extracts the value from a wrapped chainable object.
*
* @name chain
* @memberOf _
* @category Chaining
* @returns {Mixed} Returns the wrapped object.
* @example
*
* _([1, 2, 3]).value();
* // => [1, 2, 3]
*/
function wrapperChain() {
this._chain = true;
return this;
}
/**
* Extracts the value from a wrapped chainable object.
*
* @name value
* @memberOf _
* @category Chaining
* @returns {Mixed} Returns the wrapped object.
* @example
*
* _([1, 2, 3]).value();
* // => [1, 2, 3]
*/
function wrapperValue() {
return this._wrapped;
}
/*--------------------------------------------------------------------------*/
extend(lodash, {
/**
* The semantic version number.
*
* @static
* @memberOf _
* @type String
*/
'VERSION': '0.1.0',
/**
* By default, Lo-Dash uses ERB-style template delimiters, change the
* following template settings to use alternative delimiters.
*
* @static
* @memberOf _
* @type Object
*/
'templateSettings': {
/**
* Used to detect `data` property values to be HTML-escaped.
*
* @static
* @memberOf _.templateSettings
* @type RegExp
*/
'escape': /<%-([\s\S]+?)%>/g,
/**
* Used to detect code to be evaluated.
*
* @static
* @memberOf _.templateSettings
* @type RegExp
*/
'evaluate': /<%([\s\S]+?)%>/g,
/**
* Used to detect `data` property values to inject.
*
* @static
* @memberOf _.templateSettings
* @type RegExp
*/
'interpolate': /<%=([\s\S]+?)%>/g
},
// assign static methods
'after': after,
'bind': bind,
'bindAll': bindAll,
'chain': chain,
'clone': clone,
'compact': compact,
'compose': compose,
'contains': contains,
'debounce': debounce,
'defaults': defaults,
'defer': defer,
'delay': delay,
'difference': difference,
'escape': escape,
'every': every,
'extend': extend,
'filter': filter,
'find': find,
'first': first,
'flatten': flatten,
'forEach': forEach,
'functions': functions,
'groupBy': groupBy,
'has': has,
'identity': identity,
'indexOf': indexOf,
'initial': initial,
'intersection': intersection,
'invoke': invoke,
'isArguments': isArguments,
'isArray': isArray,
'isBoolean': isBoolean,
'isDate': isDate,
'isElement': isElement,
'isEmpty': isEmpty,
'isEqual': isEqual,
'isFinite': isFinite,
'isFunction': isFunction,
'isNaN': isNaN,
'isNull': isNull,
'isNumber': isNumber,
'isObject': isObject,
'isRegExp': isRegExp,
'isString': isString,
'isUndefined': isUndefined,
'keys': keys,
'last': last,
'lastIndexOf': lastIndexOf,
'map': map,
'max': max,
'memoize': memoize,
'min': min,
'mixin': mixin,
'noConflict': noConflict,
'once': once,
'pick': pick,
'pluck': pluck,
'range': range,
'reduce': reduce,
'reduceRight': reduceRight,
'reject': reject,
'rest': rest,
'result': result,
'shuffle': shuffle,
'size': size,
'some': some,
'sortBy': sortBy,
'sortedIndex': sortedIndex,
'tap': tap,
'template': template,
'throttle': throttle,
'times': times,
'toArray': toArray,
'union': union,
'uniq': uniq,
'uniqueId': uniqueId,
'values': values,
'without': without,
'wrap': wrap,
'zip': zip,
// assign aliases
'all': every,
'any': some,
'collect': map,
'detect': find,
'each': forEach,
'foldl': reduce,
'foldr': reduceRight,
'head': first,
'include': contains,
'inject': reduce,
'intersect': intersection,
'methods': functions,
'select': filter,
'tail': rest,
'take': first,
'unique': uniq
});
/*--------------------------------------------------------------------------*/
// assign private `Lodash` constructor's prototype
Lodash.prototype = lodash.prototype;
// add all of the static functions to `Lodash.prototype`
mixin(lodash);
// add all mutator Array functions to the wrapper.
forEach(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
var func = ArrayProto[methodName];
lodash.prototype[methodName] = function() {
var value = this._wrapped;
func.apply(value, arguments);
// IE compatibility mode and IE < 9 have buggy Array `shift()` and `splice()`
// functions that fail to remove the last element, `object[0]`, of
// array-like-objects even though the `length` property is set to `0`.
// The `shift()` method is buggy in IE 8 compatibility mode, while `splice()`
// is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9.
if (value.length === 0) {
delete value[0];
}
return this._chain ? new Lodash(value).chain() : value;
};
});
// add all accessor Array functions to the wrapper.
forEach(['concat', 'join', 'slice'], function(methodName) {
var func = ArrayProto[methodName];
Lodash.prototype[methodName] = function() {
var result = func.apply(this._wrapped, arguments);
return this._chain ? new Lodash(result).chain() : result;
};
});
// add `chain` and `value` after calling to `mixin()` to avoid getting wrapped
extend(Lodash.prototype, {
'chain': wrapperChain,
'value': wrapperValue
});
/*--------------------------------------------------------------------------*/
// expose Lo-Dash
if (freeExports) {
// in Node.js or RingoJS v0.8.0+
if (typeof module == 'object' && module && module.exports == freeExports) {
(module.exports = lodash)._ = lodash;
}
// in Narwhal or RingoJS v0.7.0-
else {
freeExports._ = lodash;
}
}
// in a browser or Rhino
else {
// Expose Lo-Dash to the global object even when an AMD loader is present in
// case Lo-Dash was injected by a third-party script and not intended to be
// loaded as a module. The global assignment can be reverted in the Lo-Dash
// module via its `noConflict()` method.
window._ = lodash;
// some AMD build optimizers, like r.js, check for specific condition patterns like the following:
if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
// define as an anonymous module so, through path mapping, it can be
// referenced as the "underscore" module
define(function() {
return lodash;
});
}
}
}(this));