JS: For loop vs Array.indexOf (v174)

Revision 174 of this benchmark created on

Description

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

Preparation HTML

<script>
  var ar1 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
  var ar2 = Array( 1000 );
  for(var i=0; i<1000; ++i)
    ar1[i] = i;
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
For loop === first
for (var i = 0; i < ar1.length; i++) {
 if (ar1[i] === 500 && i in ar1) {
  break;
 }
}
for (var i = 0; i < ar2.length; i++) {
 if (ar2[i] === 500 && i in ar2) {
  break;
 }
}
ready
For loop in first
for (var i = 0; i < ar1.length; i++) {
 if (i in ar1 && ar1[i] === 500) {
  break;
 }
}
for (var i = 0; i < ar2.length; i++) {
 if (i in ar2 && ar2[i] === 500) {
  break;
 }
}
ready
indexOf
var a = ar1.indexOf(500);
var b = ar2.indexOf(500);
ready
Without in
for (var i = 0; i < ar1.length; i++) {
 if (ar1[i] === 500) {
  break;
 }
}
for (var i = 0; i < ar2.length; i++) {
 if (ar2[i] === 500) {
  break;
 }
}
ready

Revisions

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