Benchmark: Member Access Object vs Map(string key) vs Map(object key)

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)])

Historical Performance Data aggregated from 49 community runs

Desktop Results:

Chrome 49 runs

Object

12K/s

Map(object key)

12K/s

Map(string key)

11K/s

View exact numbers

✓ Object: 11,926 ops/sec
• Map(object key): 11,550 ops/sec
• Map(string key): 11,472 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object
Map(string key)
Map(object key)

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36

Browser/OS: Chrome 143 on Windows

View result in a separate tab

Object

6K/s

Map(string key)

5K/s

Map(object key)

5K/s

View exact numbers

Test name	Executions per second
✓ Object	5,529 Ops/sec
Map(string key)	4,935 Ops/sec
Map(object key)	4,917 Ops/sec

Member Access Object vs Map(string key) vs Map(object key) (version: 49)

Member Access Object vs Map(string key) vs Map(object key)

Comparing performance of: `Object vs Map(string key) vs Map(object key)`

Created: 9 months ago by: Registered User

Go to the latest result

Object

Map(string key)

Map(object key)

Historical Performance Data aggregated from 49 community runs

Desktop Results:

Chrome 49 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Member Access Object vs Map(string key) vs Map(object key) (version: 49)

Member Access Object vs Map(string key) vs Map(object key)

Comparing performance of: Object vs Map(string key) vs Map(object key)

Created: 9 months ago by: Registered User

Go to the latest result

Object

Map(string key)

Map(object key)

Historical Performance Data aggregated from 49 community runs

Desktop Results:

Chrome 49 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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Comparing performance of: `Object vs Map(string key) vs Map(object key)`