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Run results for:
Map vs Object (real-world) Performance with string keys
Lookup of map vs object (in a real-world test format)
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<iframe src="https://measurethat.net/Embed?id=579341" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Conspicuous Obj lookup
338/s
Conspicuous Obj lookup 2
335/s
Conspicuous Map lookup 2
297/s
Conspicuous Map lookup
293/s
View exact numbers
Test name
Executions per second
✓
Conspicuous Obj lookup
338 Ops/sec
Conspicuous Obj lookup 2
335 Ops/sec
Conspicuous Map lookup 2
297 Ops/sec
Conspicuous Map lookup
293 Ops/sec
Script Preparation code:
var keyCount = 16384 var keys = [] var map = new Map() var obj = {} var result = 0 // 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) let val = map.get(key) result += +val[1] > 5 ? 1 : -1 }
Conspicuous Obj lookup
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) let val = obj[key] result += +val[1] > 5 ? 1 : -1 }
Conspicuous Map lookup 2
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) let val = map.get(key) result += +val[1] > 5 ? 1 : -1 }
Conspicuous Obj lookup 2
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) let val = obj[key] result += +val[1] > 5 ? 1 : -1 }