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_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6.1 Safari/605.1.15

Browser: Safari 15

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

WeakSet

104K/s

WeakMap

81K/s

set

50K/s

map

49K/s

obj

20K/s

arr

19K/s

View exact numbers

Test name	Executions per second
✓ WeakSet	104,240 Ops/sec
WeakMap	81,332 Ops/sec
set	50,025 Ops/sec
map	49,272 Ops/sec
obj	20,027 Ops/sec
arr	18,870 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))