array concat vs string append (v3)

Revision 3 of this benchmark created by Friso on

Description

Using arrays to push values and then joining them versus native string appending;

Preparation HTML

<script>
  var iterations = 1000;

  function array_join(val) {
    var sb = [];
    var i;
    sb.length = iterations;
    for (i = 0; i < iterations; ++i) {
      sb[i] = val;
    }
    return sb.join();
  }

  function append(val) {
    var str = '';
    var i;
    for (i = 0; i < iterations; ++i) {
      str += val;
    }
    return str;
  }
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
StringBuilder
array_join('abc');
ready
append
append('abc');
ready

Revisions

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