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Run results for:
Map vs Object with 100 keys and 1/5 delete on new item
Lookup of map vs object
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<iframe src="https://measurethat.net/Embed?id=617847" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/604.1.38 (KHTML, like Gecko) Chrome/49.0.2623 Safari/604.1.38 CoherentGT/2.0
Browser:
Chrome 49
Operating system:
Windows 8
Device Platform:
Desktop
Date tested:
7 months ago
Test name
Executions per second
Map set
151.9 Ops/sec
Obj set
154.0 Ops/sec
Script Preparation code:
const nbKeys = 100; var i = 0, count = 1000, a; function getRandomInt(max) { return Math.floor(Math.random() * max); } const deleteFreq = 5;
Tests:
Map set
for( let nbObj = 0; nbObj < 25; nbObj++) { let localmap = new Map(); for (i = 0; i < count; i++) { const deleteOrSet = getRandomInt(deleteFreq) !== 0 if(deleteOrSet) localmap.delete(getRandomInt(nbKeys)); else localmap.set(getRandomInt(nbKeys), getRandomInt(42)); } }
Obj set
for( let nbObj = 0; nbObj < 25; nbObj++) { let localobj = {}; for (i = 0; i < count; i++) { const deleteOrSet = getRandomInt(deleteFreq) !== 0 if(deleteOrSet) delete localobj[getRandomInt(nbKeys)]; else localobj[getRandomInt(nbKeys)] = getRandomInt(42); } }