Run results for: Map .has() vs .get()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36

Browser: Chrome 96

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
.has() and .get()	325.1 Ops/sec
.get() only	438.3 Ops/sec

Script Preparation code:

function noop() {}
map = new Map();
keys = [];

for (let i = 0; i < 10000; i++) {
  const k = new Number(i);
  keys.push(k);
  if (k % 2 !== 0) map.set(k, i);
}

Tests:

.has() and .get()
keys.forEach(k => { if (map.has(k)) noop(map.get(k)); })
.get() only
keys.forEach(k => { const v = map.get(k); if (v) noop(v); })

Run results for: Map .has() vs .get()

This is to compare the cost of this pattern ```if (map.has(key)) func1(map.get(key))``` v/s ```const v = map.get(key); if (v) func1(v);```

.has() and .get()

.get() only