Run results for: Performance difference between Object.defineProperty() and Object.defineProperties()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Object.defineProperty()

46K/s

Object.defineProperties()

32K/s

View exact numbers

Test name	Executions per second
✓ Object.defineProperty()	45,993 Ops/sec
Object.defineProperties()	31,977 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

var testProps = {}
for(let i = 1; i < 100; i++){
  if(i%2){
    testProps[`aa${i}`] = {
      value: i,
      writable: true,
      enumerable: false,
      configurable: false
    }
  } else {
    testProps[`aa${i}`] = {
      get(){
        return this[`bb${i}`]
      },
      set(nv){
        this[`bb${i}`] = 2 * nv + 3;
        return true;
      },
      enumerable: false,
      configurable: false
    }
  }
}

Tests:

Object.defineProperty()
const testObj = {}, testProps_ = {...testProps}; for(let a in testProps_){ Object.defineProperty(testObj, a, testProps_[a]); }
Object.defineProperties()
const testObj = {}, testProps_ = {...testProps}; Object.defineProperties(testObj, testProps_)