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Run results for:
Map vs WeakMap (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=521686" 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/124.0.0.0 Safari/537.36
Browser:
Chrome 124
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Conspicuous WeakMap lookup 2
46/s
Conspicuous WeakMap lookup
46/s
Conspicuous Map lookup 2
45/s
Conspicuous Map lookup
44/s
View exact numbers
Test name
Executions per second
✓
Conspicuous WeakMap lookup 2
46 Ops/sec
Conspicuous WeakMap lookup
46 Ops/sec
Conspicuous Map lookup 2
45 Ops/sec
Conspicuous Map lookup
44 Ops/sec
Script Preparation code:
var keyCount = 16384 var keys = [] var map = new Map() var weakmap = new WeakMap() // 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 = {} keys.push(key) map.set(key,val) weakmap.set(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 WeakMap lookup
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = weakmap.get(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 WeakMap lookup 2
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = weakmap.get(key) }