| /** |
| * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/> |
| * Build: `lodash modularize exports="node" -o ./compat/` |
| * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/> |
| * Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE> |
| * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors |
| * Available under MIT license <http://lodash.com/license> |
| */ |
| var baseEach = require('../internals/baseEach'), |
| charAtCallback = require('../internals/charAtCallback'), |
| createCallback = require('../functions/createCallback'), |
| isArray = require('../objects/isArray'), |
| isString = require('../objects/isString'); |
| |
| /** |
| * Retrieves the maximum value of a collection. If the collection is empty or |
| * falsey `-Infinity` is returned. If a callback is provided it will be executed |
| * for each value in the collection to generate the criterion by which the value |
| * is ranked. The callback is bound to `thisArg` and invoked with three |
| * arguments; (value, index, collection). |
| * |
| * If a property name is provided for `callback` the created "_.pluck" style |
| * callback will return the property value of the given element. |
| * |
| * If an object is provided for `callback` the created "_.where" style callback |
| * will return `true` for elements that have the properties of the given object, |
| * else `false`. |
| * |
| * @static |
| * @memberOf _ |
| * @category Collections |
| * @param {Array|Object|string} collection The collection to iterate over. |
| * @param {Function|Object|string} [callback=identity] The function called |
| * per iteration. If a property name or object is provided it will be used |
| * to create a "_.pluck" or "_.where" style callback, respectively. |
| * @param {*} [thisArg] The `this` binding of `callback`. |
| * @returns {*} Returns the maximum value. |
| * @example |
| * |
| * _.max([4, 2, 8, 6]); |
| * // => 8 |
| * |
| * var characters = [ |
| * { 'name': 'barney', 'age': 36 }, |
| * { 'name': 'fred', 'age': 40 } |
| * ]; |
| * |
| * _.max(characters, function(chr) { return chr.age; }); |
| * // => { 'name': 'fred', 'age': 40 }; |
| * |
| * // using "_.pluck" callback shorthand |
| * _.max(characters, 'age'); |
| * // => { 'name': 'fred', 'age': 40 }; |
| */ |
| function max(collection, callback, thisArg) { |
| var computed = -Infinity, |
| result = computed; |
| |
| // allows working with functions like `_.map` without using |
| // their `index` argument as a callback |
| if (typeof callback != 'function' && thisArg && thisArg[callback] === collection) { |
| callback = null; |
| } |
| if (callback == null && isArray(collection)) { |
| var index = -1, |
| length = collection.length; |
| |
| while (++index < length) { |
| var value = collection[index]; |
| if (value > result) { |
| result = value; |
| } |
| } |
| } else { |
| callback = (callback == null && isString(collection)) |
| ? charAtCallback |
| : createCallback(callback, thisArg, 3); |
| |
| baseEach(collection, function(value, index, collection) { |
| var current = callback(value, index, collection); |
| if (current > computed) { |
| computed = current; |
| result = value; |
| } |
| }); |
| } |
| return result; |
| } |
| |
| module.exports = max; |