for loop research (v58)

Revision 58 of this benchmark created on

Description

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

Setup

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

Test runner

Ready to run.

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

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

for (var i = 0, ilen = len; i < ilen; ++i) {
  worker(arr[i]);
}
ready
while alternative i--
var i = arr.length;
while (i--) {
  worker(arr[i]);
};
ready
while alternative --i
var i = arr.length;
while (--i) {
  worker(arr[i]);
};
ready
array.foreach
arr.forEach(function(value) {
  worker(value);
});
ready
for in
for (var i in arr) {
  worker[arr[i]];
}
ready

Revisions

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