Run results for: Check existence - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36

Browser: Chrome 53

Operating system: Mac OS X 10.12.0

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
typeof	1966401.0 Ops/sec
undefined	1531483.0 Ops/sec
void(8)	2466724.0 Ops/sec
!!	2571865.0 Ops/sec
if	2466314.0 Ops/sec

Website performance monitoring

Tests:

typeof
typeof window !== 'undefined'
undefined
window !== undefined
void(8)
window !== void(8)
!!
!!window
if
if (window) {}