Run results for: for loop vs for-of with index variable2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36

Browser: Chrome 85

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
for	370.3 Ops/sec
for of with index	545.0 Ops/sec

Script Preparation code:

   var arr1 = [];
   var arr2 = [];
   for (var i = 0; i < 10000; i++) {
       arr1[i] = i;
       arr2[i] = i;
   }

Tests:

for
var arr = []; for (var i = 0; i < arr2.length; i++) { arr.push({ a: arr1[i], b: arr2[i] }); }
for of with index
var arr = []; var index = 0; for (var val of arr2) { arr.push({ a: arr1[index++], b: arr2 }); }