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@std/bytes@0.197.0

denoland/std

Utilities to manipulate Uint8Arrays that are not built-in to JavaScript

JSR Score

100%

Published

2 years ago (0.197.0)

Package root>concat.ts

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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.

/** Concatenate the given arrays into a new Uint8Array.
 *
 * ```ts
 * import { concat } from "@std/bytes/concat";
 * const a = new Uint8Array([0, 1, 2]);
 * const b = new Uint8Array([3, 4, 5]);
 * console.log(concat(a, b)); // [0, 1, 2, 3, 4, 5]
 */
export function concat(...buf: Uint8Array[]): Uint8Array {
  let length = 0;
  for (const b of buf) {
    length += b.length;
  }

  const output = new Uint8Array(length);
  let index = 0;
  for (const b of buf) {
    output.set(b, index);
    index += b.length;
  }

  return output;
}