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/126.0.0.0 Safari/537.36
Chrome 126
Mac OS X 10.15.7
Desktop
2 years ago
Benchmark.js
typeof string is undefined
239.9M/s
typeof undefined is undefined
20.5M/s
string is undefined
20.3M/s
undefined is undefined
10.5M/s
View exact numbers
Test name Executions per second
✓ typeof string is undefined 239,921,760 Ops/sec
typeof undefined is undefined 20,518,070 Ops/sec
string is undefined 20,346,238 Ops/sec
undefined is undefined 10,473,260 Ops/sec
Tests: