Run results for: js forEach vs for..of for @nodejs_ru

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser: Chrome 117

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
forEach	7116.5 Ops/sec
for..of	7447.7 Ops/sec

Script Preparation code:

   var arr_num = [];
   for (var i = 0; i < 1000; i++) {
       arr_num.push(i);
   }

   function numFn(i) {
       i = i * 3 * 8;
   }

   var arr_str = [];
   for (var i = 0; i < 1000; i++) {
       arr_str.push((Math.random() + 1).toString(36).substring(7));
   }

   function strFn(i) {
       i = i + '_';
   }

   var arr_obj = [];
   for (var i = 0; i < 1000; i++) {
       arr_obj.push({
           [(Math.random() + 1).toString(36).substring(7)]: true
       });
   }

   function objFn(i) {
       i.aaa = false;
   }

Tests:

forEach
arr_num.forEach((item) => { numFn(item); }); arr_str.forEach((item) => { strFn(item); }); arr_obj.forEach((item) => { objFn(item); });
for..of
for (const element of arr_num) { numFn(element); } for (const element of arr_str) { strFn(element); } for (const element of arr_obj) { objFn(element); }