Run results for: defineproperty vs direct assignment

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 24 days ago

Test name	Executions per second
a	2845.5 Ops/sec
b	35089.5 Ops/sec

Tests:

a

var target = {};
var key = 'something';

for (var i=0; i<1000; i++) {
    Object.defineProperty(target, key+i, {
      get: function() {return _val;},
      set: function(v) { target._v = v},
    });
}

​x
 
var target = {};var key = 'something';​for (var i=0; i<1000; i++) {    Object.defineProperty(target, key+i, {      get: function() {return _val;},      set: function(v) { target._v = v},    });}

b

var target = {};
var key = 'something';

for (var i=0; i<1000; i++) {
    target[key+1] = undefined;
}

 
var target = {};var key = 'something';​for (var i=0; i<1000; i++) {    target[key+1] = undefined;}