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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=493705" 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/120.0.0.0 Safari/537.36
Browser:
Chrome 120
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
Map Lookup
6403.2 Ops/sec
Object Lookup
7315.5 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"); } }