Run results for: forinfororfor*for

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4714.0 Safari/537.36 Edg/98.0.1089.1

Browser: Chrome 98

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
forinfor	251.4 Ops/sec
for*for	123.9 Ops/sec

Script Preparation code:

var a = new Array(1000), random = Math.random, global, floor = Math.floor;
for(let i = 0; i < 1000; i++) a[i] = new Array(10).fill(random());

Tests:

forinfor
let length = a.length; for(let i = 0; i < length; i++) { let module = a[i]; for(let i2 = 0; i2 < module.length; i2++) global = module[i2]; }
for*for
let aLength = a[0].length; let length = a.length * aLength; for(let i = 0; i < length; i++) { let i2 = i % aLength, i3 = floor(i / aLength); global = a[i3][i2]; }