JS: For loop vs Array.indexOf (v101)

Revision 101 of this benchmark created on

Description

Testing speed of a standard for loop vs. Array.indexOf.

Preparation HTML

<script>
  var ar = Array();
  for (var i=0; i<1000; i++) {
     ar.push(parseInt(Math.random()*100)); // all values less than 100
  }
  ar[500] = 200; // needle
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
For loop
var a;
for (var i = 0; i < ar.length; i++) {
 if (ar[i] === 200) {
   a = ar[i];
   break;
 }
}
ready
other for-loop
var a;
for (var i = 0, n = ar.length; i < n; i++) {
 if (ar[i] === 200) {
  a = ar[i];
  break;
 }
}
ready
indexOf
var a = ar.indexOf(200);
ready
lastIndexOf
var a = ar.lastIndexOf(200);
ready

Revisions

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