Run results for: for in vs for of test

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
for of	13.9 Ops/sec
for in	1.7 Ops/sec
for each	17.3 Ops/sec
for let	139265936.0 Ops/sec

HTML Preparation code:

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

Script Preparation code:

function generateTestArray() {
  const result = [];
  for (let i = 0; i < 10000000; ++i) {
    result.push(i);
  }
  return result;
}
const array = generateTestArray()

Tests:

for of
for (const i of array){}
for in
for (const i in array){}
for each
array.forEach((i) =>{})
for let
for (let i=0; i<array.length; i++){ }

Run results for: for in vs for of test

for of

for in

for each

for let