For Loop (v164)

Revision 164 of this benchmark created on

Preparation HTML

<script type="text/javascript" src="http://underscorejs.org/underscore-min.js"></script>
<script type="text/javascript"src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script>
  var use_ = false;
  var R = use_ ? _.range : function (n,t) {
    var arr = [];
    for (var i=n; i <= t;i++) arr.push(i);
    return arr;
  };

  var ARR = R(1,10000);

  function loop1(arr) {
var i = 0;
while (i < arr.length) {
  arr[i];
  i++;
};
  }

  function loop2(arr) {
for (var i = 0; i < arr.length; ++i) {
  arr[i];
};
  }
</script>

Setup

var arr = ARR;

Test runner

Ready to run.

Testing in
TestOps/sec
while loop that imitates a for loop
loop1(arr);
ready
while loop that imitates a for loop, caching the length
var i = 0,
    len = arr.length;
while (i < len) {
  arr[i];
  i++;
};
ready
Reverse while loop
var i = arr.length;
while (i--) {
  arr[i];
};
ready
Reverse while loop without implicit ToBoolean
var i = arr.length;
while (i-- > 0) {
  arr[i];
};
ready
Reverse do … while loop
var i = arr.length;
do {
  arr[i];
} while (i--);
ready
Reverse for loop
for (var i = arr.length; i--;) {
  arr[i];
};
ready
Old ’n’ busted for loop
loop2(arr);
ready
Old ’n’ busted for loop, caching the length
for (var i = 0, len = arr.length; i < len; ++i) {
  arr[i];
};
ready
Cool guy loop
for (var i = -1; ++i < arr.length;) {
  arr[i];
};
ready
Cool guy loop, caching the length
for (var i = -1, len = arr.length; ++i < len;) {
  arr[i];
};
ready
Native Array#forEach implementation
arr.forEach(function(x) {
  x;
});
ready
Native Array#forEach implementation with named function
function foo(x) {
  x;
};
arr.forEach(foo);
ready
Loop case 1
var i;
for (i = 0; i < arr.length; i += 1) {
  arr[i];
}
ready
Loop case 2
var i, l;
for (i = 0, l = arr.length; i < l; i += 1) {
  arr[i];
}
ready
For Loop case trois
var i = 0,
    l = arr.length;

for (i; i < l; i++) {
  console.log(arr[i]);
}
ready
jQuery each
$.each(arr,function(v){
v;
})
ready
Underscore Each
_.each(arr,function(v){
v;
})
ready
MDN Loop
var i=0;
var v;
for (i, v; v = arr[i++];) {
v;
}
ready
MDN Loop with operation
var i=0;
var v;
for (i, v; v = arr[i++];) {
v=Math.random();
}
ready

Revisions

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