| /** |
| * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/> |
| * Build: `lodash modularize modern exports="node" -o ./modern/` |
| * 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 createCallback = require('../functions/createCallback'); |
| |
| /** |
| * This method is like `_.find` except that it returns the index of the first |
| * element that passes the callback check, instead of the element itself. |
| * |
| * 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 Arrays |
| * @param {Array} array The array to search. |
| * @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 {number} Returns the index of the found element, else `-1`. |
| * @example |
| * |
| * var characters = [ |
| * { 'name': 'barney', 'age': 36, 'blocked': false }, |
| * { 'name': 'fred', 'age': 40, 'blocked': true }, |
| * { 'name': 'pebbles', 'age': 1, 'blocked': false } |
| * ]; |
| * |
| * _.findIndex(characters, function(chr) { |
| * return chr.age < 20; |
| * }); |
| * // => 2 |
| * |
| * // using "_.where" callback shorthand |
| * _.findIndex(characters, { 'age': 36 }); |
| * // => 0 |
| * |
| * // using "_.pluck" callback shorthand |
| * _.findIndex(characters, 'blocked'); |
| * // => 1 |
| */ |
| function findIndex(array, callback, thisArg) { |
| var index = -1, |
| length = array ? array.length : 0; |
| |
| callback = createCallback(callback, thisArg, 3); |
| while (++index < length) { |
| if (callback(array[index], index, array)) { |
| return index; |
| } |
| } |
| return -1; |
| } |
| |
| module.exports = findIndex; |