std/uuid/_common.ts


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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
export function bytesToUuid(bytes: number[] | Uint8Array): string {
  const bits: string[] = [...bytes].map((bit): string => {
    const s: string = 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),
  ].join("");
}