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Run results for:
Map vs Object (real-world) Performance
Lookup of map vs object (in a real-world test format)
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<iframe src="https://measurethat.net/Embed?id=619520" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 26
Operating system:
iOS 18.6
Device Platform:
Mobile
Date tested:
9 months ago
Conspicuous Map lookup
2K/s
Conspicuous Map lookup 2
2K/s
Conspicuous Obj lookup
549/s
Conspicuous Obj lookup 2
524/s
View exact numbers
Test name
Executions per second
✓
Conspicuous Map lookup
1,900 Ops/sec
Conspicuous Map lookup 2
1,787 Ops/sec
Conspicuous Obj lookup
549 Ops/sec
Conspicuous Obj lookup 2
524 Ops/sec
Script Preparation code:
var keyCount = 16384 var keys = [] var map = new Map() var obj = {} // Hide lookup keys to prevent V8 cheating (AKA Optimizing) var getConspicuousKey = seed => keys[Math.floor(seed * keyCount)] // Setup out test objects w/ random values for (let i=0; i<keyCount; i++) { let val = Math.random() let key = Math.random() keys.push(key) map.set(key,val) obj[key] = val }
Tests:
Conspicuous Map lookup
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = map.get(key) }
Conspicuous Obj lookup
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = obj[key] }
Conspicuous Map lookup 2
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = map.get(key) }
Conspicuous Obj lookup 2
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = obj[key] }