Run results for: Check properties in an object

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Truthy	1920726.0 Ops/sec
HasOwnProperty	2204818.0 Ops/sec
In	2256228.0 Ops/sec
Typeof	1956625.0 Ops/sec
Undefined	511981.2 Ops/sec
Void	2107398.0 Ops/sec

Script Preparation code:

var obj = {
  'undefined': undefined,
  'null': null,
  'zero': 0,
  'one': 1,
  'symbol': Symbol('symbol')
};

var properties = ['test', 'one', 'symbol', 'null', 'zero', 'undefined', 'toString'];

var testResult = (obj, method, ...properties) => {
  let result = 0;
  for(let prop of properties) {
    if(method(obj, prop)) {
      result++;
    }
  }
  return result;
}

Tests:

Truthy
testResult(obj, (o, p) => !!o[p], ...properties)
HasOwnProperty
testResult(obj, (o, p) => o.hasOwnProperty(p), ...properties)
In
testResult(obj, (o, p) => p in o, ...properties)
Typeof
testResult(obj, (o, p) => 'undefined' !== typeof o[p], ...properties)
Undefined
testResult(obj, (o, p) => undefined !== o[p], ...properties)
Void
testResult(obj, (o, p) => void(0) !== o[p], ...properties)

Run results for: Check properties in an object

Check properties in an object

Truthy

HasOwnProperty

In

Typeof

Undefined

Void