30 lines
1.0 KiB
JavaScript
30 lines
1.0 KiB
JavaScript
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//#region src/array/takeRightWhile.ts
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/**
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* Takes elements from the end of the array while the predicate function returns `true`.
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*
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* @template T - Type of elements in the input array.
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*
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* @param {T[]} arr - The array to take elements from.
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* @param {(item: T, index: number, array: readonly T[]) => boolean} shouldContinueTaking - The function invoked per element with the item, its index, and the array.
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* @returns {T[]} A new array containing the elements taken from the end while the predicate returns `true`.
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*
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* @example
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* // Returns [3, 2, 1]
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* takeRightWhile([5, 4, 3, 2, 1], n => n < 4);
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*
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* @example
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* // Returns []
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* takeRightWhile([1, 2, 3], n => n > 3);
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*
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* @example
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* // Using index parameter
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* takeRightWhile([10, 20, 30, 40], (x, index) => index > 1);
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* // Returns: [30, 40]
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*/
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function takeRightWhile(arr, shouldContinueTaking) {
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for (let i = arr.length - 1; i >= 0; i--) if (!shouldContinueTaking(arr[i], i, arr)) return arr.slice(i + 1);
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return arr.slice();
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}
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//#endregion
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exports.takeRightWhile = takeRightWhile;
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