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Run results for:
Map vs Object (Lookup then delete keys) Performance
Lookup of map vs object then delete keys
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<iframe src="https://measurethat.net/Embed?id=587864" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0
Browser:
Firefox 135
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Conspicuous Map lookup & delete
2438.3 Ops/sec
Conspicuous Obj lookup & delete
130.9 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 & delete
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = map.get(key) if (a) map.delete(key) }
Conspicuous Obj lookup & delete
for (let i=0; i<keyCount; i++) { let seed = Math.random() let key = getConspicuousKey(seed) a = obj[key] if (a) delete obj[key] }