Javascript array concat vs push

JavaScript performance comparison

Revision 141 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var arr1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
  var arr2 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
  var arr3 = []

};
</script>

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
push
var l1 = arr1.length;
var l2 = arr2.length;

for( var i=0; i<l2; i++){
   arr1[ l1+i ] = arr2[i];
}
pending…
extend one by one
var l1 = arr1.length;
var l2 = arr2.length;
arr1.length = l1 + l2;
for( var i=0; i<l2; i++){
   arr1[ l1+i ] = arr2[i];
}
pending…
push one by one
var l2 = arr2.length;
for( var i=0; i<l2; i++){
   arr1.push( arr2[i] );
}
pending…
push without length cache
for( var i=0; i<arr2.length; i++){
   arr1.push( arr2[i] );
}
pending…

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL.

0 Comments