Run results for: Iterator vs Index for loop

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Index for loop

99K/s

Iterator for loop

18K/s

View exact numbers

Test name	Executions per second
✓ Index for loop	99,447 Ops/sec
Iterator for loop	17,980 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]; }