Run results for: func initializer vs inlined init

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 months ago

Test name	Executions per second
old style clone initializer	805775.8 Ops/sec
mini-initializer	802369.7 Ops/sec
array prealloc	788558.7 Ops/sec

Script Preparation code:

let A=[document.createElement('div'),document.createElement('a'),document.createElement('p')]
let B=(a,b)=>{
  let d=A[a].cloneNode();
  d.className=b;
  return d;
}
let

Tests:

old style clone initializer
let C=[A[2].cloneNode(),A[0].cloneNode(),A[1].cloneNode(),A[0].cloneNode(),A[0].cloneNode(),A[0].cloneNode(),A[0].cloneNode(),A[0].cloneNode()] C[0].className='a b c' C[1].className='d e f' C[2].className='x y z' C[3].className='a b' C[4].className='c d' C[5].className='c d' C[6].className='c d' C[7].className='c d'
mini-initializer
let D=[B(2,'a b c'),B(0,'d e f'),B(1,'x y z'),B(0,'a b'),B(0,'c d'),B(0,'c d'),B(0,'c d'),B(0,'c d')]
array prealloc
let E=Array(8); E[0x0]=B(2,'a b c'); E[0x1]=B(0,'d e f'); E[0x2]=B(1,'x y z'); E[0x3]=B(0,'a b'); E[0x4]=B(0,'c d'); E[0x5]=B(0,'c d'); E[0x6]=B(0,'c d'); E[0x7]=B(0,'c d');

Run results for: func initializer vs inlined init

old style clone initializer

mini-initializer

array prealloc