Maybe this is a dumb question, but there seems to be a bit of confusion about using ismissing(x) versus x === missing, and isnothing(x) versus x === nothing at [ANN] ShowLint - #3 by Mason . I would say that in both cases, the functions are clearer for new Julia users. This is supported by the docum…

[image] rikh: So, is it right that ismissing and isnothing is prefered except when you need to squeeze every last bit of performance? Using === (or !==) allows the compiler to disregard the other alternative type if the inferred type is e.g. a Union{Nothing, T}. Using == or isnothing does no…

Ismissing(x) versus x === missing

General Usage

rikh December 21, 2020, 2:44pm 4

I’ve replied to this at [ANN] ShowLint - #11 by rikh.

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Ismissing(x) versus x === missing

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