Looping with Justin

JavaScript performance comparison

Test case created

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script src="//underscorejs.org/underscore-min.js"></script>
<script>
Benchmark.prototype.setup = function() {
    var myArray = [];
   
    for (var i = 0; i < 100000; i++) {
      myArray.push(i);
    }
};
</script>

Preparation code output

Test runner

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Testing in unknown unknown
Test Ops/sec
jQuery
jQuery.each(myArray, function(index, value) {
  return value;
});
pending…
Underscore
_.each(myArray, function(element, index, list) {
  return element;
});
pending…
Native (cached length)
var length = myArray.length;

for (var i = 0; i < length; i++) {
    return myArray[i];
}
pending…
Native
for (var i = 0; i < myArray.length; i++) {
    return myArray[i];
}
pending…

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