Info

Cache length in for loop

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var range = [];
    
    for (var i = 0; i < 10000; i++) {
      range.push(i);
    }
    
    function multiplyByTwo(num) {
      return num * 2;
    }
  };
</script>

Test runner

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var result = [];

for (var i = 0, m = range.length; i < m; i++) {
  result.push(multiplyByTwo(range[i]));
}

var result = range.map(multiplyByTwo);

var result = [];

range.forEach(function(val) {
  result.push(multiplyByTwo(val));
});

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published on 7th February 2013
• Revision 2: published by Qubyte on 15th February 2013
• Revision 3: published by Blaise Kal on 15th February 2013
• Revision 4: published on 5th March 2013

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