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37 lines
1.1 KiB
TypeScript
37 lines
1.1 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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/**
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* Returns a new array that drops all elements in the given collection until the
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* last element that does not match the given predicate.
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*
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* @typeParam T The type of the elements in the input array.
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*
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* @param array The array to drop elements from.
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* @param predicate The function to test each element for a condition.
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*
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* @returns A new array that drops all elements until the last element that does
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* not match the given predicate.
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*
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* @example Basic usage
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* ```ts
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* import { dropLastWhile } from "@std/collections/drop-last-while";
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* import { assertEquals } from "@std/assert/assert-equals";
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*
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* const numbers = [11, 42, 55, 20, 33, 44];
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*
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* const notFortyFour = dropLastWhile(numbers, (number) => number > 30);
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*
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* assertEquals(notFortyFour, [11, 42, 55, 20]);
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* ```
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*/
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export function dropLastWhile<T>(
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array: readonly T[],
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predicate: (el: T) => boolean,
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): T[] {
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let offset = array.length;
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while (0 < offset && predicate(array[offset - 1] as T)) offset--;
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return array.slice(0, offset);
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}
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