Editing node-uuid performance

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

<script>
  /*
    * Generate a RFC4122(v4) UUID
    *
    * Documentation at https://github.com/broofa/node-uuid
    */
  
  // Use node.js Buffer class if available, otherwise use the Array class
  var BufferClass = typeof(Buffer) == 'function' ? Buffer : Array;
  
  // Buffer used for generating string uuids
  var _buf = new BufferClass(16);
  
  // Cache number <-> hex string for octet values
  var toString = [];
  var toNumber = {};
  for (var i = 0; i < 256; i++) {
    toString[i] = (i + 0x100).toString(16).substr(1).toUpperCase();
    toNumber[toString[i]] = i;
  }
  
  function parse(s) {
    var buf = new BufferClass(16);
    var i = 0,
        ton = toNumber;
    s.toUpperCase().replace(/[0-9A-F][0-9A-F]/g, function(octet) {
      buf[i++] = toNumber[octet];
    });
    return buf;
  }
  
  function unparse(buf) {
    var tos = toString,
        b = buf;
    return tos[b[0]] + tos[b[1]] + tos[b[2]] + tos[b[3]] + '-' + tos[b[4]] + tos[b[5]] + '-' + tos[b[6]] + tos[b[7]] + '-' + tos[b[8]] + tos[b[9]] + '-' + tos[b[10]] + tos[b[11]] + tos[b[12]] + tos[b[13]] + tos[b[14]] + tos[b[15]];
  }
  
  function uuid(fmt, buf, offset) {
    var b32 = 0x100000000,
        ff = 0xff;
  
    var b = fmt != 'binary' ? _buf : (buf ? buf : new BufferClass(16));
    var i = buf && offset || 0;
  
    r = Math.random() * b32;
    b[i++] = r & ff;
    b[i++] = (r = r >>> 8) & ff;
    b[i++] = (r = r >>> 8) & ff;
    b[i++] = (r = r >>> 8) & ff;
    r = Math.random() * b32;
    b[i++] = r & ff;
    b[i++] = (r = r >>> 8) & ff;
    b[i++] = (r = r >>> 8) & 0x0f | 0x40; // See RFC4122 sect. 4.1.3
    b[i++] = (r = r >>> 8) & ff;
    r = Math.random() * b32;
    b[i++] = r & 0x3f | 0x80; // See RFC4122 sect. 4.4
    b[i++] = (r = r >>> 8) & ff;
    b[i++] = (r = r >>> 8) & ff;
    b[i++] = (r = r >>> 8) & ff;
    r = Math.random() * b32;
    b[i++] = r & ff;
    b[i++] = (r = r >>> 8) & ff;
    b[i++] = (r = r >>> 8) & ff;
    b[i++] = (r = r >>> 8) & ff;
  
    return fmt === undefined ? unparse(b) : b;
  };
  
  uuid.parse = parse;
  uuid.unparse = unparse;
  uuid.BufferClass = BufferClass;
  
  var buf = new uuid.BufferClass(16);
</script>

Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

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Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

uuid();

Test 2

Title

Async (check if this is an asynchronous test)

Code

uuid('binary');

Test 3

Title

Async (check if this is an asynchronous test)

Code

uuid('binary', buf);