Run results for: Loop forward vs. reverse

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:131.0) Gecko/20100101 Firefox/131.0

Browser: Firefox 131

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Reverse

2.3M/s

Forward

1.7M/s

View exact numbers

Test name	Executions per second
✓ Reverse	2,275,268 Ops/sec
Forward	1,685,650 Ops/sec

Script Preparation code:

var arr = [];
var count = 1000;
for(var i = 0; i<count; i++)
{
  arr.push(i);
}

Tests:

Forward
const arrLen = arr.length; let sum = 0; for (let i = 0; i < arrLen; i++){ sum ++; }
Reverse
const arrLen = arr.length; let sum = 0; for (let i = arrLen - 1; i; i--){ sum ++; }