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:
b<h1>fish</h1>???,?/2??Bm?????????????
Other
Other
Desktop
one year ago
Test name Executions per second
typeof string is undefined 51969628.0 Ops/sec
typeof undefined is undefined 4099780.0 Ops/sec
string is undefined 3344374.8 Ops/sec
undefined is undefined 1876129.4 Ops/sec
Tests:

  • typeof string is undefined

  • typeof undefined is undefined

  • string is undefined

  • undefined is undefined