std/uuid/_common.ts

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

/**
 * Converts the byte array to a UUID string
 * @param bytes Used to convert Byte to Hex
 */
export function bytesToUuid(bytes: number[] | Uint8Array): string {
  const bits = [...bytes].map((bit) => {
    const s = bit.toString(16);
    return bit < 0x10 ? "0" + s : s;
  });
  return [
    ...bits.slice(0, 4),
    "-",
    ...bits.slice(4, 6),
    "-",
    ...bits.slice(6, 8),
    "-",
    ...bits.slice(8, 10),
    "-",
    ...bits.slice(10, 16),
  ].join("");
}

/**
 * Converts a string to a byte array by converting the hex value to a number.
 * @param uuid Value that gets converted.
 */
export function uuidToBytes(uuid: string): number[] {
  const bytes: number[] = [];

  uuid.replace(/[a-fA-F0-9]{2}/g, (hex: string): string => {
    bytes.push(parseInt(hex, 16));
    return "";
  });

  return bytes;
}