for loop research (v44)

Revision 44 of this benchmark created by X on

Description

Various for-loop variants: * with length caching * with various counter increment (++i, i++) * while alternative

Preparation HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/2.4.1/lodash.js"></script>

Setup

var arr = [];
    
    for (var i = 0; i < 1000; i++) {
      arr.push('arr-value-' + i);
    }
    
    function worker() {
      return (1 + 1);
    }

Test runner

Ready to run.

Testing in
TestOps/sec
classic for-loop
for (var i = 0; i < arr.length; i++) {
  worker();
}
ready
++i
for (var i = 0; i < arr.length; ++i) {
  worker();
}
ready
caching length in loop
for (var i = 0, len = arr.length; i < len; i++) {
  worker();
}
ready
caching length outside loop
var len = arr.length;

for (var i = 0; i < len; i++) {
  worker();
}
ready
double caching length
var len = arr.length;

for (var i = 0, ilen = len; i < ilen; i++) {
  worker();
}
ready
while alternative i--
var i = arr.length;
while (i--) {
  worker();
};
ready
while alternative --i
var i = arr.length;
while (--i) {
  worker();
};
ready
lodash
_(arr).forEach(function(i) {
  worker();
});
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.