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std/collections/drop_while.ts

Deno standard library
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** * Returns a new array that drops all elements in the given collection until the * first element that does not match the given predicate * * Example: * * ```ts * import { dropWhile } from "https://deno.land/std@$STD_VERSION/collections/mod.ts"; * import { assertEquals } from "https://deno.land/std@$STD_VERSION/testing/asserts.ts"; * * const numbers = [ 3, 2, 5, 2, 5 ] * const dropWhileNumbers = dropWhile(numbers, i => i !== 2) * * assertEquals(dropWhileNumbers, [2, 5, 2, 5 ]) * ``` */export function dropWhile<T>( array: readonly T[], predicate: (el: T) => boolean,): T[] { let offset = 0; const length = array.length;
while (length > offset && predicate(array[offset])) { offset++; }
return array.slice(offset, length);}