Run results for: for-in vs for-of-entires with class

Run details:

User agent: Mozilla/5.0 (Linux; Android 13; 22011211C Build/TP1A.220624.014; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.197 Mobile Safari/537.36 Lark/7.3.5 LarkLocale/zh_CN ChannelName/Feishu TTWebView/1141130051413

Browser: Chrome Mobile 114

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
for of	418.5 Ops/sec
for in	393.7 Ops/sec

Script Preparation code:

class A {
  a = 1
  b = 2
  c = 3
  d = 4
  
  method1(){}
  method2(){}
}

class B extends A {
  str = 'long string'
  nested = {
    	nested: 0
  }
  method3(){}
  method4(){}
}

class C extends B {
  hello = 55.5
  method4(){}
  method5(){}
}

var obj = new C()
var copy = {}

Tests:

for of
for(let i=0;i<1000;i++){ let itrator = Object.entries(obj) for(let [k,v] of itrator){ copy[k] = v } }
for in
for(let i=0;i<1000;i++){ for(let k in obj){ copy[k] = obj[k] } }

Run results for: for-in vs for-of-entires with class

for of

for in