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Run results for:
Object vs Map lookup with int keys
Comparing the performance of lookups in large objects vs large maps when the keys are strings.
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<iframe src="https://measurethat.net/Embed?id=508703" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.0
Browser:
Firefox 123
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
Map Lookup
10124.5 Ops/sec
Object Lookup
10908.2 Ops/sec
Script Preparation code:
window.m = new Map(); window.o = {}; for (let i = 0; i < 1000; ++i) { window.m.set(i, i); window.o[i] = i; }
Tests:
Map Lookup
for (let i = 0; i < 1000; ++i) { if (window.m.get(i) !== i) { console.log("bad map key"); } }
Object Lookup
for (let i = 0; i < 1000; ++i) { if (window.o[i] !== i) { console.log("bad object key"); } }