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typeof variable === "object" potentially problematic #249

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mjsarfatti opened this issue May 27, 2020 · 1 comment
Open

typeof variable === "object" potentially problematic #249

mjsarfatti opened this issue May 27, 2020 · 1 comment

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@mjsarfatti
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On the type checking section the following is recommended to see if a variable is an object:

typeof variable === "object"

The problem is that:

typeof null === "object"

So the recommendation should probably read:

typeof variable === "object" && variable !== null
@ferdnyc
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ferdnyc commented Jan 2, 2024

Though, some coders will prefer to shorten that to,

typeof variable === "object" && variable

(That works because, if variable is an object, only null will test false.)

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@ferdnyc @mjsarfatti