Run results for: Testing loops performance

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Browser: Chrome 54

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
For loop, decrementing	141.2 Ops/sec
For loop, incrementing	107.4 Ops/sec
forEach	355.1 Ops/sec
For loop, incrementing, cache length	123.3 Ops/sec

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]