Benchmark: Map .has() only vs .get() only

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
.has()
.get() only

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.229 Whale/2.10.123.42 Safari/537.36

Browser/OS: Chrome 90 on Windows

View result in a separate tab

Test name	Executions per second
.has()	488.8 Ops/sec
.get() only	484.0 Ops/sec

Map .has() only vs .get() only (version: 0)

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

Comparing performance of: .has() vs .get() only

Created: 2 years ago by: Guest

Jump to the latest result

.has()

.get() only

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A