Run results for: Map get VS Map has then get

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36 Edg/135.0.0.0

Browser: Chrome 135

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Map 1

22K/s

Map 2

13K/s

View exact numbers

Test name	Executions per second
✓ Map 1	21,946 Ops/sec
Map 2	12,510 Ops/sec

Script Preparation code:

var i = 0, count = 1000, a;
var map = new Map();

for (i = 0; i < count; i++) {
  if (Math.random() > 0.5) {
    map.set(i, { val: 'a' });
  }
}

Tests:

Map 1
for (i = 0; i < count; i++) { let newVal = map.get(i); if (a) { a = newVal; } }
Map 2
for (i = 0; i < count; i++) { if (map.has(i)) { a = map.get(i).val; } }

Run results for: Map get VS Map has then get

Map get VS Map has get

Map 1

Map 2