31 lines
1.1 KiB
JavaScript
31 lines
1.1 KiB
JavaScript
import { isArrayLike } from "../predicate/isArrayLike.mjs";
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//#region src/compat/array/indexOf.ts
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/**
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* Finds the index of the first occurrence of a value in an array.
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*
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* This method is similar to `Array.prototype.indexOf`, but it also finds `NaN` values.
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* It uses strict equality (`===`) to compare elements.
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*
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* @template T - The type of elements in the array.
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* @param array - The array to search.
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* @param searchElement - The value to search for.
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* @param [fromIndex] - The index to start the search at.
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* @returns The index (zero-based) of the first occurrence of the value in the array, or `-1` if the value is not found.
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*
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* @example
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* const array = [1, 2, 3, NaN];
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* indexOf(array, 3); // => 2
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* indexOf(array, NaN); // => 3
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*/
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function indexOf(array, searchElement, fromIndex) {
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if (!isArrayLike(array)) return -1;
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if (Number.isNaN(searchElement)) {
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fromIndex = fromIndex ?? 0;
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if (fromIndex < 0) fromIndex = Math.max(0, array.length + fromIndex);
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for (let i = fromIndex; i < array.length; i++) if (Number.isNaN(array[i])) return i;
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return -1;
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}
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return Array.from(array).indexOf(searchElement, fromIndex);
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}
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//#endregion
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export { indexOf };
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