Actually fix UUID, and separate the NodeJS version from the Browser version

snippets/UUIDGeneratorNode.md

@@ -0,0 +1,18 @@
+### UUIDGenerator
+
+Generates a UUID in Node.JS.
+
+Use `crypto` API to generate a UUID, compliant with [RFC4122](https://www.ietf.org/rfc/rfc4122.txt) version 4.
+
+```js
+const crypto = require("crypto");
+
+const UUIDGenerator = () =>
+  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
+    (c ^ (crypto.randomBytes(1)[0] & (15 >> (c / 4)))).toString(16)
+  );
+```
+
+```js
+UUIDGenerator(); // '79c7c136-60ee-40a2-beb2-856f1feabefc'
+```