| /** |
| * 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 baseIndexOf = require('../internals/baseIndexOf'), |
| sortedIndex = require('./sortedIndex'); |
| |
| /* Native method shortcuts for methods with the same name as other `lodash` methods */ |
| var nativeMax = Math.max; |
| |
| /** |
| * 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 |
| * providing `true` for `fromIndex` will run a faster binary search. |
| * |
| * @static |
| * @memberOf _ |
| * @category Arrays |
| * @param {Array} array The array to search. |
| * @param {*} value The value to search for. |
| * @param {boolean|number} [fromIndex=0] The index to search from or `true` |
| * to perform a binary search on a sorted array. |
| * @returns {number} Returns the index of the matched value or `-1`. |
| * @example |
| * |
| * _.indexOf([1, 2, 3, 1, 2, 3], 2); |
| * // => 1 |
| * |
| * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3); |
| * // => 4 |
| * |
| * _.indexOf([1, 1, 2, 2, 3, 3], 2, true); |
| * // => 2 |
| */ |
| function indexOf(array, value, fromIndex) { |
| if (typeof fromIndex == 'number') { |
| var length = array ? array.length : 0; |
| fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0); |
| } else if (fromIndex) { |
| var index = sortedIndex(array, value); |
| return array[index] === value ? index : -1; |
| } |
| return baseIndexOf(array, value, fromIndex); |
| } |
| |
| module.exports = indexOf; |