Run results for: new empty object vs constant vs frozen constant 2 - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.5.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
new empty	141646.3 Ops/sec
var	51315.7 Ops/sec
var frozen	48215.8 Ops/sec
fn new	143363.8 Ops/sec
fn var	46941.2 Ops/sec
fn frozen	45035.6 Ops/sec
const	179862.0 Ops/sec
new2	137009.9 Ops/sec

Script Preparation code:

var empty={};
var frozen=Object.freeze({});
var fnNew=()=>({});
var fnConstant=()=>empty;
var fnFrozen=()=>frozen;

Tests:

new empty
const arr=new Array(500).fill().map(()=>({}));
var
const arr=new Array(500).fill().map(()=>empty);
var frozen
const arr=new Array(500).fill().map(()=>frozen);
fn new
const arr=new Array(500).fill().map(fnNew);
fn var
const arr=new Array(500).fill().map(fnConstant);
fn frozen
const arr=new Array(500).fill().map(fnFrozen);
const
const mty={}; const arr=new Array(500).fill().map(()=>mty);
new2
const dummy={}; const arr=new Array(500).fill().map(()=>({}));