Benchmark: Testing loops performance

Script Preparation code:

var i, values = [], sum = 0;
for (i = 0; i < 10000; i++) values[i] = i;

Tests:

For loop, decrementing
for (i = values.length; i--;) sum += values[i];
For loop, incrementing
for (i = 0; i < values.length; i++) sum += values[i];
forEach
values.forEach(function(value) { sum += value });
For loop, incrementing, cache length
var len = values.length; for (i = 0; i < len; i++) sum += values[i];
Different for
for (i in values) sum += values[i]

Rendered benchmark preparation results:

Previous results

Test case name	Result
For loop, decrementing
For loop, incrementing
forEach
For loop, incrementing, cache length
Different for

ⓘ Get performance results from real users on your website with Request Metrics.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.59 Safari/537.36 OPR/41.0.2353.46

Browser/OS: Opera 41 on Windows

Test name	Executions per second
For loop, decrementing	174.4 Ops/sec
For loop, incrementing	139.3 Ops/sec
forEach	460.0 Ops/sec
For loop, incrementing, cache length	154.1 Ops/sec
Different for	189.1 Ops/sec

Testing loops performance (version: 1)