JavaScript bitwise NOT vs Math.floor()

JavaScript performance comparison

Revision 25 of this test case created by Spencer

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var numbers = [];
  
  //generate amount random numbers
  for (var i = 0; i < 100000; i++) {
    numbers[numbers.length] = Math.random() * 100000;
  }

};
</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
Math.floor()
var test;
for (var i = 0; i < 100000; i++) {
  test = Math.floor(numbers[i] * 100) / 100;
}
pending…
bitwise NOT
var test;
for (var i = 0; i < 100000; i++) {
  test = ~~(numbers[i] * 100) / 100;
}
pending…
roundToTwo Func
var test;
for (var i = 0; i < 100000; i++) {
  test = +(Math.round(numbers[i] + "e+2")  + "e-2");
}
pending…
Math.round
var test;
for (var i = 0; i < 100000; i++) {
  test = Math.round(numbers[i] * 100) / 100;
}
pending…
toFixed(2)
var test;
for (var i = 0; i < 100000; i++) {
  test = numbers[i].toFixed(2);
}
pending…
combo
var test;
for (var i = 0; i < 100000; i++) {
  test = (Math.floor(numbers[i] * 100) / 100).toFixed(2)
}
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