MeasureThat.net

Run results for: is variable undefined? typeof variable === "undefined" vs variable === undefined

Comparing whether checking is (typeof variable === "undefined") is faster than (variable === undefined)

Go to the benchmark
Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.85 YaBrowser/21.11.0.2054 Yowser/2.5 Safari/537.36
Yandex Browser 21
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
typeof string is undefined 942681792.0 Ops/sec
typeof undefined is undefined 7923341.0 Ops/sec
string is undefined 7915368.5 Ops/sec
undefined is undefined 3948542.5 Ops/sec
Tests:

  • typeof string is undefined

  • typeof undefined is undefined

  • string is undefined

  • undefined is undefined

;