Run results for: optimized loop

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36

Browser: Chrome 73

Operating system: Mac OS X 10.14.4

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
Unoptimized	60.1 Ops/sec
Optimized	116.6 Ops/sec

Script Preparation code:

  var array = new Array();
  for (var i = 0; i < 100000; i++) {
    array.push(i);
  }

​x
 
​  var array = new Array();  for (var i = 0; i < 100000; i++) {    array.push(i);  }

Tests:

var dummy = 0;
for (var i = 0; i < array.length; i++) {
  dummy += array[i];
}

 
var dummy = 0;for (var i = 0; i < array.length; i++) {  dummy += array[i];}

var dummy = 0;
for (var i = 0, al = array.length; i < al; i++) {
  dummy += array[i];
}

 
var dummy = 0;for (var i = 0, al = array.length; i < al; i++) {  dummy += array[i];}