1 files changed, 18 insertions, 0 deletions
diff --git a/std/uuid/_common.ts b/std/uuid/_common.ts
new file mode 100644
index 000000000..b0cad2584
--- /dev/null
+++ b/std/uuid/_common.ts
@@ -0,0 +1,18 @@
+// 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("");
+}