Run results for: for vs for of4

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
for	56.7 Ops/sec
for of	5.9 Ops/sec

Script Preparation code:

var count = 1000 * 1000
var data = [];

do {
  data.push(count--);
} while(count);

​x
 
var count = 1000 * 1000var data = [];​do {  data.push(count--);} while(count);

Tests:

let sum = 0;
for (const obj of data) {
  sum += obj;
}

 
let sum = 0;for (const obj of data) {  sum += obj;}

let sum = 0;
for (let index = 0; index < data.length; index++) {
  sum += data[index];
}

 
let sum = 0;for (let index = 0; index < data.length; index++) {  sum += data[index];}