Run results for: Loop test

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:56.0) Gecko/20100101 Firefox/56.0

Browser: Firefox 56

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Script Preparation code:

var arr = [];
for(var i=0;i<1000;i++){
    arr.push(i);
}

Tests:

Indexed for
var sum = 0 for(var i=0,len = arr.length;i<len;i++){ sum += arr[i]; }
For in
var sum = 0 for(var a in arr){ sum += a; }
Backwards for
var sum = 0 for(var i=arr.length-1;i>=0;i--){ sum += arr[i]; }
Backwards while
var sum = 0 var i = arr.length; while(i--){ sum += arr[i]; }