string index vs string charAt

JavaScript performance comparison

Revision 3 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var str = "g9p87ngyp876ncw65-8ut9-84ttttp1n[8xt[ntg[5nf87y42xn49p54545454mny0t968uy908u9ymi409yikj,obvmy985uv98n7y87fy5786fty6t687t71t76r276bt87y4npt9vhm98phvt9";
  
  var indexesLen = 10, indexes = new Array(indexesLen), i, j;
  for (i = 0; i < indexesLen; ++i)
    indexes[i] = Math.floor(Math.random(i * str.length));

};
</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
string index
for (j = 0; j < indexesLen; ++j)
  str[indexes[j]];
pending…
string charAt
for (j = 0; j < indexesLen; ++j)
  str.charAt(indexes[j]);
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