Run results for: nullish tests - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

strict equals null

64.5M/s

loose not-equals null

63.5M/s

strict equals undefined

61.5M/s

loose not-equals undefined

61.5M/s

typeof

61.1M/s

in

61.0M/s

strict not-equals null

60.5M/s

loose equals null

60.4M/s

loose equals undefined

58.6M/s

strict not-equals undefined

58.1M/s

bool

57.7M/s

hasOwnProperty

38.4M/s

View exact numbers

Test name	Executions per second
✓ strict equals null	64,481,352 Ops/sec
loose not-equals null	63,533,808 Ops/sec
strict equals undefined	61,481,408 Ops/sec
loose not-equals undefined	61,455,116 Ops/sec
typeof	61,133,860 Ops/sec
in	61,029,332 Ops/sec
strict not-equals null	60,530,664 Ops/sec
loose equals null	60,420,380 Ops/sec
loose equals undefined	58,636,224 Ops/sec
strict not-equals undefined	58,116,084 Ops/sec
bool	57,719,076 Ops/sec
hasOwnProperty	38,365,400 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']