// 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 "https://deno.land/std@$STD_VERSION/bytes/concat.ts";
 * 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;
}