Run results for: obj inheritance create assign setproto

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Mac OS X 10.14.0

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
setproto	268518.8 Ops/sec
assign_create	234894.5 Ops/sec
create	313207.6 Ops/sec
proto	276900.6 Ops/sec
factory	136220.4 Ops/sec
assign	107026.3 Ops/sec

Script Preparation code:

(function(){
  function _base() {
    return {
      a:111,b:1,c:'2134124141',
      d:'werrqwer',e:'34234',fffffffff:'324234',
      gggggg:'99999',jadf:'adsfa',asdfasdf:'asdf',asdfasdf:'sadf',
      [Math.random()]:Math.random(),
      [Math.random()]:Math.random()
    }
  }

  
(function(){
	const base = _base()
	window.assign = function(x){
		return Object.assign({[Math.random()+'x']:Math.random()+'x'+x},base)
  	}
})();

(function(){
	const base = _base()
	window.setproto = function(x){
        const z = Object.setPrototypeOf({
          [Math.random()+'x']: Math.random()+'x'+x
        },base)
		return z
	}
})();
  
  (function(){
	const base = _base()
	window.proto = function(x){
        const z = {
          [Math.random()+'x']: Math.random()+'x'+x
        }
        z.__proto__ = base
		return z
	}
})();
  
 
  (function(){
	const base = _base()
	window.create = function(x){
        const p = Object.create(base)
        p[Math.random()+'x'] = Math.random()+'x'+x
		return p
	}
})();
  
(function(){
	const base = _base()
	window.assign_create = function(x){
        return Object.assign(Object.create(base),
			{ [Math.random()+'x']: Math.random()+'x'+x}
        )
	}
})();
      
  
 (function(){
	const base = _base()
	window.factory = function(x){
        const o = _base()
        o[Math.random()+'x'] = Math.random()+'x'+x
		return o
	}
})();

})()

Tests:

setproto
setproto('a')
assign_create
assign_create('b')
create
create('d')
proto
proto('e')
factory
factory('3')
assign
assign('4')