Benchmark: For loop comparison

Script Preparation code:

var arr = [];
var n = 0;
var i;
var l;
for (i = 0; i < 1000; i++) {
  arr[i] = i;
}

Tests:

Normal
for (i = 0; i < arr.length; i++) { n += arr[i]; }
Extra assignment
for (i = 0, l = arr.length; i < l; i++) { n += arr[i]; }
Assignment before the loop
var l = arr.length; for (i = 0; i < l; i++) { n += arr[i]; }

Rendered benchmark preparation results:

Previous results

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Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Browser/OS: Chrome 55 on Linux

For loop comparison (version: 0)