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29 lines
977 B
29 lines
977 B
3 years ago
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import getLength from './_getLength.js';
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import { slice } from './_setup.js';
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import isNaN from './isNaN.js';
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// Internal function to generate the `_.indexOf` and `_.lastIndexOf` functions.
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export default function createIndexFinder(dir, predicateFind, sortedIndex) {
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return function(array, item, idx) {
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var i = 0, length = getLength(array);
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if (typeof idx == 'number') {
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if (dir > 0) {
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i = idx >= 0 ? idx : Math.max(idx + length, i);
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} else {
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length = idx >= 0 ? Math.min(idx + 1, length) : idx + length + 1;
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}
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} else if (sortedIndex && idx && length) {
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idx = sortedIndex(array, item);
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return array[idx] === item ? idx : -1;
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}
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if (item !== item) {
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idx = predicateFind(slice.call(array, i, length), isNaN);
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return idx >= 0 ? idx + i : -1;
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}
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for (idx = dir > 0 ? i : length - 1; idx >= 0 && idx < length; idx += dir) {
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if (array[idx] === item) return idx;
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}
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return -1;
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};
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}
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