Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36
Chrome 103
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
for 13433.7 Ops/sec
for each 60055.6 Ops/sec
forEach 726580.5 Ops/sec
Script Preparation code:
x
 
var array = new Array(1000);
for (var i = 0; i < array.length; i++) {
  array[i] = i;
}
Tests:
  • for

     
    let sum = 0;
    for (var i = 0; i < array.length; i++) {
      sum += array[i];
    }
  • for each

     
    let sum = 0;
    for (var item in array) {
      sum += item;
    }
  • forEach

     
    let sum = 0;
    array.forEach(function(item, index) {
      sum += item;
    });