proto_speed_browser.js

var times = 500000,
    benchmarks = {},
    objects,
    sys = {
      puts: function() { console.log.apply(console, arguments); }
    };

function bm(label, fn) {
  benchmarks[label] = fn;
};

function run(label) {
  // Keep references to constructed objects so that garbage collection does not
  // skew the numbers.
  objects = [];

  var start = +new Date
  benchmarks[label]();
  sys.puts('  ' + label + ' : ' + (+new Date - start) + ' ms')
};

bm('dynamic',function(){
  var n = times;
  function A(){
   this.method = function(){ return 5; }
  }
  while (n--) {
    objects.push( new A() );
  }  
});

bm('prototype',function(){
  var n = times;
  function A(){}
  A.prototype.method = function(){ return 5; }
  while (n--) {
    objects.push( new A() );
  }
})

bm('dynamic 10',function(){
  var n = times;
  function A(){
   this.method1 = function(){ return 1; }
   this.method2 = function(){ return 2; }
   this.method3 = function(){ return 3; }
   this.method4 = function(){ return 4; }
   this.method5 = function(){ return 5; }
   this.method6 = function(){ return 6; }
   this.method7 = function(){ return 7; }
   this.method8 = function(){ return 8; }
   this.method9 = function(){ return 9; }
   this.method10 = function(){ return 10; }
  }
  while (n--) {
    objects.push( new A() );
  }  
});

bm('prototype 10 methods (obj)',function(){
  var n = times;
  function A(){}
  A.prototype = {
    method1 : function(){ return 1; },
    method2 : function(){ return 2; },
    method3 : function(){ return 3; },
    method4 : function(){ return 4; },
    method5 : function(){ return 5; },
    method6 : function(){ return 6; },
    method7 : function(){ return 7; },
    method8 : function(){ return 8; },
    method9 : function(){ return 9; },
    method10 : function(){ return 10; }
  }
  while (n--) {
    objects.push( new A() );
  }
})

bm('prototype 10 methods (items)',function(){
  var n = times
  function A(){}
  A.prototype.method1 = function(){ return 1; }
  A.prototype.method2 = function(){ return 2; }
  A.prototype.method3 = function(){ return 3; }
  A.prototype.method4 = function(){ return 4; }
  A.prototype.method5 = function(){ return 5; }
  A.prototype.method6 = function(){ return 6; }
  A.prototype.method7 = function(){ return 7; }
  A.prototype.method8 = function(){ return 8; }
  A.prototype.method9 = function(){ return 9; }
  A.prototype.method10 = function(){ return 10; }
  while (n--) {
    objects.push( new A() );
  }
})


bm('prototype 10 methods (items alt)',function(){
  var n = times;
  function A(){}
  a = A.prototype;
  a.method1 = function(){ return 1; }
  a.method2 = function(){ return 2; }
  a.method3 = function(){ return 3; }
  a.method4 = function(){ return 4; }
  a.method5 = function(){ return 5; }
  a.method6 = function(){ return 6; }
  a.method7 = function(){ return 7; }
  a.method8 = function(){ return 8; }
  a.method9 = function(){ return 9; }
  a.method10 = function(){ return 10; }
  while (n--) {
    objects.push( new A() );
  }
})