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Module

std/bytes/repeat.ts

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 Uint8Array composed of `count` repetitions of the `source` * array. * * If `count` is negative, a `RangeError` is thrown. * * ```ts * import { repeat } from "https://deno.land/std@$STD_VERSION/bytes/repeat.ts"; * const source = new Uint8Array([0, 1, 2]); * console.log(repeat(source, 3)); // [0, 1, 2, 0, 1, 2, 0, 1, 2] * console.log(repeat(source, 0)); // [] * console.log(repeat(source, -1)); // RangeError * ``` */export function repeat(source: Uint8Array, count: number): Uint8Array { if (count === 0) { return new Uint8Array(); }
if (count < 0) { throw new RangeError("bytes: negative repeat count"); }
if (!Number.isInteger(count)) { throw new Error("bytes: repeat count must be an integer"); }
const nb = new Uint8Array(source.length * count);
let bp = copy(source, nb);
for (; bp < nb.length; bp *= 2) { copy(nb.slice(0, bp), nb, bp); }
return nb;}