UUID generators (v14)

Revision 14 of this benchmark created on

Setup

function b() { return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
      var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
      return v.toString(16);
  });}
  
  function e1() {
    var u='',i=0;
    while(i++<36) {
      var c='xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'[i-1],r=Math.random()*16|0,v=c=='x'?r:(r&0x3|0x8);
      u+=(c=='-'||c=='4')?c:v.toString(16)
    }
    return u;
  }
  
  function e2() {
    var u='',m='xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx',i=0,rb=Math.random()*0xffffffff|0;
    while(i++<36) {
      var c=m[i-1],r=rb&0xf,v=c=='x'?r:(r&0x3|0x8);
      u+=(c=='-'||c=='4')?c:v.toString(16);rb=i%8==0?Math.random()*0xffffffff|0:rb>>4
    }
    return u
  }
  
  function e3() {
    var l='0123456789abcdef';
    var m='xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx';
    var u='',i=0,rb=Math.random()*0xffffffff|0;
    while(i++<36) {
      var c=m[i-1],r=rb&0xf,v=c=='x'?r:(r&0x3|0x8);
      u+=(c=='-'||c=='4')?c:l[v];rb=i%8==0?Math.random()*0xffffffff|0:rb>>4
    }
    return u
  }
  
  function e4() {
    var h=['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'];
    var k=['x','x','x','x','x','x','x','x','-','x','x','x','x','-','4','x','x','x','-','y','x','x','x','-','x','x','x','x','x','x','x','x','x','x','x','x'];
    var u='',i=0,rb=Math.random()*0xffffffff|0;
    while(i++<36) {
      var c=k[i-1],r=rb&0xf,v=c=='x'?r:(r&0x3|0x8);
      u+=(c=='-'||c=='4')?c:h[v];rb=i%8==0?Math.random()*0xffffffff|0:rb>>4
    }
    return u
  }
  
  var lut = new Array(256);
  lut = [
          '00', '01', '02', '03', '04', '05', '06', '07', '08', '09', '0a', '0b', '0c', '0d', '0e', '0f',
          '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '1a', '1b', '1c', '1d', '1e', '1f',
          '20', '21', '22', '23', '24', '25', '26', '27', '28', '29', '2a', '2b', '2c', '2d', '2e', '2f',
          '30', '31', '32', '33', '34', '35', '36', '37', '38', '39', '3a', '3b', '3c', '3d', '3e', '3f',
          '40', '41', '42', '43', '44', '45', '46', '47', '48', '49', '4a', '4b', '4c', '4d', '4e', '4f',
          '50', '51', '52', '53', '54', '55', '56', '57', '58', '59', '5a', '5b', '5c', '5d', '5e', '5f',
          '60', '61', '62', '63', '64', '65', '66', '67', '68', '69', '6a', '6b', '6c', '6d', '6e', '6f',
          '70', '71', '72', '73', '74', '75', '76', '77', '78', '79', '7a', '7b', '7c', '7d', '7e', '7f',
          '80', '81', '82', '83', '84', '85', '86', '87', '88', '89', '8a', '8b', '8c', '8d', '8e', '8f',
          '90', '91', '92', '93', '94', '95', '96', '97', '98', '99', '9a', '9b', '9c', '9d', '9e', '9f',
          'a0', 'a1', 'a2', 'a3', 'a4', 'a5', 'a6', 'a7', 'a8', 'a9', 'aa', 'ab', 'ac', 'ad', 'ae', 'af',
          'b0', 'b1', 'b2', 'b3', 'b4', 'b5', 'b6', 'b7', 'b8', 'b9', 'ba', 'bb', 'bc', 'bd', 'be', 'bf',
          'c0', 'c1', 'c2', 'c3', 'c4', 'c5', 'c6', 'c7', 'c8', 'c9', 'ca', 'cb', 'cc', 'cd', 'ce', 'cf',
          'd0', 'd1', 'd2', 'd3', 'd4', 'd5', 'd6', 'd7', 'd8', 'd9', 'da', 'db', 'dc', 'dd', 'de', 'df',
          'e0', 'e1', 'e2', 'e3', 'e4', 'e5', 'e6', 'e7', 'e8', 'e9', 'ea', 'eb', 'ec', 'ed', 'ee', 'ef',
          'f0', 'f1', 'f2', 'f3', 'f4', 'f5', 'f6', 'f7', 'f8', 'f9', 'fa', 'fb', 'fc', 'fd', 'fe', 'ff'
      ];
  function e5() {
    var k=['x','x','x','x','-','x','x','-','4','x','-','y','x','-','x','x','x','x','x','x'];
    var u='',i=0,rb=Math.random()*0xffffffff|0;
    while(i++<20) {
      var c=k[i-1],r=rb&0xff,v=c=='x'?r:(c=='y'?(r&0x3f|0x80):(r&0xf|0x40));
      u+=(c=='-')?c:lut[v];rb=i%4==0?Math.random()*0xffffffff|0:rb>>8
    }
    return u
  }
  
  function e6() {
    var k=['x','x','-','x','-','4','-','y','-','x','x','x'];
    var u='',i=0,rb=Math.random()*0xffffffff|0;
    while(i++<12) {
      var c=k[i-1],r=rb&0xffff,v=c=='x'?r:(c=='y'?(r&0x3fff|0x8000):(r&0xfff|0x4000));
      u+=(c=='-')?c:(lut[v>>8]+lut[v&0xff]);rb=i&1?rb>>16:Math.random()*0xffffffff|0
    }
    return u
  }
  
  function e7()
      {
      var d0 = Math.random()*0xffffffff|0;
      var d1 = Math.random()*0xffffffff|0;
      var d2 = Math.random()*0xffffffff|0;
      var d3 = Math.random()*0xffffffff|0;
      return lut[d0&0xff]+lut[d0>>8&0xff]+lut[d0>>16&0xff]+lut[d0>>24&0xff]+'-'+
        lut[d1&0xff]+lut[d1>>8&0xff]+'-'+lut[d1>>16&0x0f|0x40]+lut[d1>>24&0xff]+'-'+
        lut[d2&0x3f|0x80]+lut[d2>>8&0xff]+'-'+lut[d2>>16&0xff]+lut[d2>>24&0xff]+
        lut[d3&0xff]+lut[d3>>8&0xff]+lut[d3>>16&0xff]+lut[d3>>24&0xff];
    }
  
  function s4() {
    return Math.floor((1 + Math.random()) * 0x10000)
               .toString(16)
               .substring(1);
  };
  
  function guid() {
    return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
           s4() + '-' + s4() + s4() + s4();
  }
  
  function generateQuickGuid() {
      return Math.random().toString(36).substring(2, 15) +
          Math.random().toString(36).substring(2, 15);
  }

Test runner

Ready to run.

Testing in
TestOps/sec
broofa
b()
ready
e1
e1()
ready
e2
e2()
ready
e3
e3()
ready
e4
e4()
ready
e5
e5()
ready
e6
e6()
ready
generateQuickGuid
generateQuickGuid()
ready
guid_accepted
guid()
ready
e7
e7()
ready

Revisions

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