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46 lines
1.3 KiB
46 lines
1.3 KiB
var baseFindIndex = require('./_baseFindIndex'), |
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baseIsNaN = require('./_baseIsNaN'), |
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strictLastIndexOf = require('./_strictLastIndexOf'), |
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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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nativeMin = Math.min; |
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/** |
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* This method is like `_.indexOf` except that it iterates over elements of |
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* `array` from right to left. |
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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=array.length-1] 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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* _.lastIndexOf([1, 2, 1, 2], 2); |
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* // => 3 |
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* |
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* // Search from the `fromIndex`. |
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* _.lastIndexOf([1, 2, 1, 2], 2, 2); |
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* // => 1 |
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*/ |
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function lastIndexOf(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 = length; |
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if (fromIndex !== undefined) { |
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index = toInteger(fromIndex); |
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index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1); |
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} |
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return value === value |
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? strictLastIndexOf(array, value, index) |
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: baseFindIndex(array, baseIsNaN, index, true); |
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} |
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module.exports = lastIndexOf;
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