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: 4 months ago

Test name	Executions per second
Forward	1685650.0 Ops/sec
Reverse	2275267.5 Ops/sec

Script Preparation code:

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

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

Tests:

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

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

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

​x
 
const arrLen = arr.length;let sum = 0;for (let i = arrLen - 1; i; i--){  sum ++;}​