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42 lines
1.2 KiB
42 lines
1.2 KiB
var baseIndexOf = require('./_baseIndexOf'), |
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toInteger = require('./toInteger'); |
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/* Built-in method references for those with the same name as other `lodash` methods. */ |
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var nativeMax = Math.max; |
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/** |
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* Gets the index at which the first occurrence of `value` is found in `array` |
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* using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) |
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* for equality comparisons. If `fromIndex` is negative, it's used as the |
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* offset from the end of `array`. |
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* |
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* @static |
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* @memberOf _ |
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* @since 0.1.0 |
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* @category Array |
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* @param {Array} array The array to inspect. |
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* @param {*} value The value to search for. |
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* @param {number} [fromIndex=0] The index to search from. |
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* @returns {number} Returns the index of the matched value, else `-1`. |
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* @example |
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* |
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* _.indexOf([1, 2, 1, 2], 2); |
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* // => 1 |
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* |
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* // Search from the `fromIndex`. |
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* _.indexOf([1, 2, 1, 2], 2, 2); |
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* // => 3 |
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*/ |
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function indexOf(array, value, fromIndex) { |
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var length = array == null ? 0 : array.length; |
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if (!length) { |
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return -1; |
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} |
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var index = fromIndex == null ? 0 : toInteger(fromIndex); |
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if (index < 0) { |
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index = nativeMax(length + index, 0); |
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} |
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return baseIndexOf(array, value, index); |
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} |
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module.exports = indexOf;
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