Run results for: ForIn vs ForEach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:82.0) Gecko/20100101 Firefox/82.0

Browser: Firefox 82

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 4 years ago

Script Preparation code:

   var arr = [];
   for (var i = 0; i < 10000; i++) {
       arr[i] = i;
   }

   function someFn(i) {
       return i * 2;
   }

Tests: