Run results for: typeof "undefined" versus falsey check

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser: Chrome 124

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

negate

6.5M/s

typeof

6.5M/s

View exact numbers

Test name	Executions per second
✓ negate	6,488,988 Ops/sec
typeof	6,487,204 Ops/sec

Script Preparation code:

const undef = undefined
function checkType(val) {
  return typeof val === 'undefined'
}
function negate(val) {
  return !val
}

Tests: