Silobox lets you compare different JavaScript snippets to allow you to determine which performs better in different browsers.

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Example: Which loop performs better?

for (var i = 0; i < items.length; i++) {

}

or

for (var i = 0, l = items.length; i<l; i++) {

}

or

for (var i = items.length; i--;) {

}

or

var i = items.length;
while (i--) {
  
}

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What do you get?