proto_speed.js

var sys = require('sys'),
    times = 500000

function bm(label, fn) {
  var start = +new Date
  fn()
  sys.puts('  ' + label + ' : ' + (+new Date - start) + ' ms')
};


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

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

bm('dynamic 10',function(){
  var n = times
  while (n--) {
    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; }
    }
    new A();
  }  
});

bm('prototype 10 methods (obj)',function(){
  var n = times
  while (n--) {
    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; }
    }
    new A();
  }
})

bm('prototype 10 methods (items)',function(){
  var n = times
  while (n--) {
    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; }
    new A();
  }
})


bm('prototype 10 methods (items alt)',function(){
  var n = times
  while (n--) {
    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; }
    new A();
  }
})