Run results for: Member Access Object vs Map(string key) vs Map(object key)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser: Chrome 142

Operating system: Windows

Device Platform: Desktop

Date tested: 9 months ago

Object

15.4M/s

Map(object key)

13.5M/s

Map(string key)

13.4M/s

View exact numbers

Test name	Executions per second
✓ Object	15,360,055 Ops/sec
Map(object key)	13,502,444 Ops/sec
Map(string key)	13,448,758 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

const N = 1<<16
let tmp;

const getInt = (()=>{r=Math.random;f=Math.floor;return (a=0,b=0x100000000)=>f(r()*(b-a))+a})();
const getStr = ((n=8,a=0x20,b=0xD7B0)=>String.fromCharCode(...Array(n).fill(0,0,n).map(()=>getInt(a,b))))

const objS = {};
const mapS = new Map();
const mapO = new Map();
const strKeys = new Array(N);
const objKeys = new Array(N);

for(i=0;i<N;i++)
{
    const strKey = getStr();
    const objKey = { key : strKey };
    const value = { num : getInt(), str : getStr(0x100)};
    objS[strKey] = value;
    mapS.set(strKey, value);
    mapO.set(objKey, value);
    strKeys[i] = strKey;
    objKeys[i] = objKey;
}

Tests:

Object
for(i=0;i<0x400;i++) tmp = objS[strKeys[getInt(0,N)]]
Map(string key)
for(i=0;i<0x400;i++) tmp = mapS.get(strKeys[getInt(0,N)])
Map(object key)
for(i=0;i<0x400;i++) tmp = mapO.get(objKeys[getInt(0,N)])