Different kinds of loop (v13)

Revision 13 of this benchmark created on

Setup

var arr = [], obj = {};
      
    (function (){
      for( var i = 0; i < 1000000; i++ ) {
        arr[i] = 'value' + i;
        obj[i] = 'value' + i;
      }    
    }());
    
    var sum = 0;
      
    function someFn (ix) {
      return sum ^= ix;
    }

Teardown


    if(sum % 17 === 0){
      console.log(sum);
    }

Test runner

Ready to run.

Testing in
TestOps/sec
for counting down pre-decrement
for (var i = arr.length; i > 0; --i) {
    someFn(i);
}
ready
var i in arr
for( var i in arr ) {
    someFn(i);
}
ready
var i in arr (with hasOwnProperty check)
for( var i in arr ) {
    if( !arr.hasOwnProperty( i ) ) continue;
    someFn(i);
}
ready
var i in obj
for( var i in obj ) {
    someFn(i);
}
ready
var i in obj (with hasOwnProperty check)
for( var i in obj ) {
    if( !obj.hasOwnProperty( i ) ) continue;
    someFn(i);
}
ready
for i < arr.length (without caching)
for( var i = 0; i < arr.length; i++ ) {
    someFn(i);
}
ready
for i < arr.length (with caching)
for( var i = 0, max = arr.length; i < max; i++ ) {
    someFn(i);
}
ready
for, counting down
for (var i = arr.length; i > 0; i--) {
    someFn(i);
}
ready
while i < arr.length (without caching)
var i = 0;
do 
{
    someFn(i);
    i++;
}
while (i < arr.length);
ready
while i < arr.length (with caching)
var i = 0, max = arr.length;
do 
{
    someFn(i);
    i++;
}
while (i < max);
ready
while, counting down
var i = arr.length;
do
{
    someFn(i);
    i--;
}
while (i > 0);
ready
while, counting down (2)
var i = arr.length - 1;
do
{
    someFn(i);
}
while (i-- != 0);
ready
while, counting down (3)
var i = arr.length;
if (i > 0)
{
    do
    {
        someFn(i);
    }
    while (--i != 0); // i must be greater than 0 here
}
ready
super for again
for (var i = arr.length; i > 0; --i) {
    someFn(i);
}
ready

Revisions

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