Run results for: Iterator vs Index for loop

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:146.0) Gecko/20100101 Firefox/146.0

Browser: Firefox 146

Operating system: Windows

Device Platform: Desktop

Date tested: 7 months ago

Index for loop

36K/s

Iterator for loop

12K/s

View exact numbers

Test name	Executions per second
✓ Index for loop	35,900 Ops/sec
Iterator for loop	11,642 Ops/sec

Script Preparation code:

var arr = [];
for(let i = 0; i < 10000; i++) {
  arr.push(Math.random());
}

Tests:

Iterator for loop
let sum = 0; for(const num of arr) { sum += num; }
Index for loop
let sum = 0; for(let i = 0; i < arr.length; i++) { sum += arr[i]; }