Run results for: for vs for of vs for in

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 14

Operating system: iOS 14.0

Device Platform: Mobile

Date tested: 4 years ago

Tests:

const arr = Array(10000).fill(0);
const l = arr.length;
for (let i = 0; i < l; i++) {
  arr[i];
}

AخA
 
const arr = Array(10000).fill(0);const l = arr.length;for (let i = 0; i < l; i++) {  arr[i];}

const arr = Array(10000).fill(0);
for (let x of arr) {
  x;
}

 
const arr = Array(10000).fill(0);for (let x of arr) {  x;}

const arr = Array(10000).fill(0);
for (let i in arr) {
  arr[i];
}

 
const arr = Array(10000).fill(0);for (let i in arr) {  arr[i];}