Run results for: Array loop for() vs for(in) 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 temp=0;   
var arr = [];
    for (var i = 0; i < 10000; i++) {
      arr[i] = i;
    }

Tests:

foreach
var temp=0; arr.forEach(function (item){ temp+=item; })
for
var temp=0; for (var i = 0, len = arr.length; i < len; i++) { temp+=arr[i]; }
for(in)
var temp=0; for(let n in arr) temp+=arr[n];