caching length (v22)

Revision 22 of this benchmark created by rustinlee on

Preparation HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.7.0/lodash.min.js"></script>

Setup

var arr = [];
    for (var i = 0; i < 5000; i++) {
      arr[i] = Math.random();
    }

Test runner

Ready to run.

Testing in
TestOps/sec
while loop
var len = arr.length;
while (len--) {
  arr[len] *= 2;
}
ready
do-while loop
var len = arr.length;
do {
  arr[len] *= 2;
} while (len--);
ready
Prefix Increment
for (var i = 0; i < arr.length; ++i) {
  arr[i] *= 2;
}
ready
Prefix + Cached
for (var i = 0, len = arr.length; i < len; ++i) {
  arr[i] *= 2;
}
ready
Array map
arr.map(function(el) {
  return el * 2;
});
ready
Reverse cached
for (var i = arr.length - 1; i >= 0; i--) {
  arr[i] *= 2;
}
ready
lodash 3.7.0 each
_.each(arr, function (n, i) {
  arr[i] = n * 2;
});
ready
lodash 3.7.0 each 2
_.each(arr, function (n, i) {
  arr[i] *= 2;
});
ready

Revisions

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