Run results for: nullish tests - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36

Browser: Chrome 88

Operating system: Mac OS X 11.2.0

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
loose equals undefined	4092863.0 Ops/sec
loose not-equals undefined	4540506.5 Ops/sec
strict equals undefined	4476512.5 Ops/sec
strict not-equals undefined	4419200.0 Ops/sec
loose equals null	14104514.0 Ops/sec
loose not-equals null	14046252.0 Ops/sec
strict equals null	14094024.0 Ops/sec
strict not-equals null	13980406.0 Ops/sec
typeof	12168670.0 Ops/sec
in	13355762.0 Ops/sec
hasOwnProperty	12488008.0 Ops/sec
bool	14078613.0 Ops/sec

Script Preparation code:

var obj = {};

Tests:

loose equals undefined
obj['a'] == undefined;
loose not-equals undefined
obj['a'] != undefined;
strict equals undefined
obj['a'] === undefined;
strict not-equals undefined
obj['a'] !== undefined;
loose equals null
obj['a'] == null;
loose not-equals null
obj['a'] != null;
strict equals null
obj['a'] === null
strict not-equals null
obj['a'] !== null
typeof
typeof obj['a'] === 'undefined'
in
'a' in obj;
hasOwnProperty
obj.hasOwnProperty('a');
bool
!!obj['a']