Run results for: Map v Object v Set v Array memory overhead

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:128.0) Gecko/20100101 Firefox/128.0

Browser: Firefox 128

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

WeakSet

56K/s

WeakMap

56K/s

set

54K/s

map

38K/s

arr

28K/s

obj

18K/s

View exact numbers

Test name	Executions per second
✓ WeakSet	56,357 Ops/sec
WeakMap	55,519 Ops/sec
set	53,726 Ops/sec
map	37,762 Ops/sec
arr	28,320 Ops/sec
obj	17,799 Ops/sec

Script Preparation code:

var map = new Map();
var set = new Set();
var obj = {};
var arr = [];
var weakMap = new WeakMap();
var weakSet = new WeakSet();

const a = Array.from({
    length: 1000
});

var vals = a.map(v => Math.random() * 1000);

var valsString = a.map(v => String(Math.random() * 1000));

var valsObj = a.map(v => {
    return {
        v: Math.random() * 1000
    }
});

Tests:

map
vals.forEach(va => map.set(va, va))
set
vals.forEach(va => set.add(va))
obj
valsString.forEach(va => obj[va] = va)
arr
valsString.forEach(va => arr.push(va))
WeakMap
valsObj.forEach(va => weakMap.set(va, va))
WeakSet
valsObj.forEach(va => weakSet.add(va))