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

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

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0
Firefox 121
Windows
Desktop
2 years ago
Benchmark.js
typeof undefined is undefined
697.5M/s
typeof string is undefined
697.4M/s
undefined is undefined
696.4M/s
string is undefined
687.5M/s
View exact numbers
Test name Executions per second
✓ typeof undefined is undefined 697,516,096 Ops/sec
typeof string is undefined 697,428,992 Ops/sec
undefined is undefined 696,407,168 Ops/sec
string is undefined 687,491,008 Ops/sec
Tests: