Run results for: Array loop vs foreach vs map, by objects

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0

Browser: Firefox 65

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Script Preparation code:

   var arr = [];
    for (var i = 0; i < 10000; i++) {
      arr[i] = {
        key : i,
        value : i *10
      };
    }

Tests:

for
for (var i = 0, len = arr.length; i < len; i++) { arr[i].value = arr[i].value * 3 * 8; }
map
arr = arr.map(item => { item.value = item.value * 3 * 8; return item; });
forEach
arr.forEach(function (item){ item.value = item.value * 3 * 8; })