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Module

std/bytes/repeat.ts

The Deno Standard Library
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.import { copy } from "./copy.ts";
/** * Returns a new byte slice composed of `count` repetitions of the `source` * array. * * @param source Source array to repeat. * @param count Number of times to repeat the source array. * @returns A new byte slice composed of `count` repetitions of the `source` * array. * * @example Basic usage * ```ts * import { repeat } from "https://deno.land/std@$STD_VERSION/bytes/repeat.ts"; * * const source = new Uint8Array([0, 1, 2]); * * repeat(source, 3); // Uint8Array(9) [0, 1, 2, 0, 1, 2, 0, 1, 2] * * repeat(source, 0); // Uint8Array(0) [] * * repeat(source, -1); // Throws `RangeError` * ``` */export function repeat(source: Uint8Array, count: number): Uint8Array { if (count < 0 || !Number.isInteger(count)) { throw new RangeError("Count must be a non-negative integer"); }
const repeated = new Uint8Array(source.length * count); let offset = 0;
while (offset < repeated.length) { offset += copy(source, repeated, offset); }
return repeated;}