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Run results for:
Map vs Object few vs many keys
Compares usage of Map vs object in two cases - many keys and few keys (< 30)
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<iframe src="https://measurethat.net/Embed?id=604875" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36 Edg/136.0.0.0
Browser:
Chrome 136
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Obj lookup - small
9K/s
Map lookup - tiny
9K/s
Map lookup - small
9K/s
Obj lookup - tiny
8K/s
Map lookup - large
7K/s
Obj lookup - large
4K/s
View exact numbers
Test name
Executions per second
✓
Obj lookup - small
8,923 Ops/sec
Map lookup - tiny
8,652 Ops/sec
Map lookup - small
8,546 Ops/sec
Obj lookup - tiny
7,901 Ops/sec
Map lookup - large
6,862 Ops/sec
Obj lookup - large
4,372 Ops/sec
Script Preparation code:
const createKeyTestThings = n => { const keys = [] const map = new Map() const obj = {} const getConspicuousKey = seed => keys[Math.floor(seed * n)] for (let i = 0; i < n; i++) { const val = Math.random() const key = Math.random() keys.push(key) map.set(key, val) obj[key] = val } return { obj, map, getConspicuousKey } } const largeN = 16384, smallN = 100, tinyN = 15 const large = createKeyTestThings(largeN) const small = createKeyTestThings(smallN) const tiny = createKeyTestThings(tinyN)
Tests:
Map lookup - large
const { getConspicuousKey, map } = large for (let i=0; i<1000; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = map.get(key) }
Map lookup - small
const { getConspicuousKey, map } = small for (let i=0; i<1000; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = map.get(key) }
Map lookup - tiny
const { getConspicuousKey, map } = tiny for (let i=0; i<1000; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = map.get(key) }
Obj lookup - large
const { getConspicuousKey, obj } = large for (let i=0; i<1000; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = obj[key] }
Obj lookup - small
const { getConspicuousKey, obj } = small for (let i=0; i<1000; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = obj[key] }
Obj lookup - tiny
const { getConspicuousKey, obj } = tiny for (let i=0; i<1000; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = obj[key] }