Run results for: Object vs Map lookup with int keys

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0

Browser: Firefox 134

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Object Lookup

8K/s

Map Lookup

7K/s

View exact numbers

Test name	Executions per second
✓ Object Lookup	8,242 Ops/sec
Map Lookup	6,505 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"); } }