Run results for: Map vs WeakMap

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

Map

100.9M/s

WeakMap

52.3M/s

View exact numbers

Test name	Executions per second
✓ Map	100,871,936 Ops/sec
WeakMap	52,259,004 Ops/sec

HTML Preparation code:

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

Script Preparation code:

const getInt = (()=>{r=Math.random;f=Math.floor;return (a=0,b=0x100000000)=>f(r()*(b-a))+a})();
const getStr = (()=>{
    const f = (n)=> n < 10 ? 0x30 + n : n < 36 ? 0x41 + (n - 10) : 0x61 + (n - 36);
    return (n)=> String.fromCharCode(...(new Int32Array(n)).map(()=>f(getInt(0,62)))); 
})();

const keys = [];
const N = 0x40000;

const map = new Map();
const weakmap = new WeakMap();

for(i=0;i<N;i++){
	let key = {i};
  	let value = getInt();
	map.set(key,value);
	weakmap.set(key,value);
	keys[i] = key;
}

Tests:

Map
var a = map.get(keys[getInt(0,N)]);
WeakMap
var a = weakmap.get(keys[getInt(0,N)]);