If memory serves me, once upon a time there was a proposal to simplify syntax for missing values: T? == Union{T, Missing} Currently I have to handle a lot of missing values and find the extra typing quite annoying. Is there still a plan to integrate this into julia? How do other people handle th…

You can write f(x::@?(Int), y::Int) = x+y with tkf’s clever macro, from this earlier discussion: [image] Aliases for Union{T, Nothing} and Union{T, Missing}? New to Julia How about @?Int? ex = frowning macro _(ex) if $(rand() > 0.5) :(Union{$ex, No…

cool macro, scares me to use it in production code :fearful:

of course without the random Nothing/Missing switch

Why? If you are living on the edge already… :wink:

Would it make sense to add this at the beginning of your project? for T in collection_of_types @eval const $(Symbol(T, :_)) = Union{$T, Missing} end (with collection_of_types being a collection of all the types with possible missing values you are working with, and replacing :_ by any suitable…

[image] gdkrmr: Is there still a plan to integrate this into julia? There is no consensus whether it should mean Union{T, Nothing} or Union{T, Missing}.

I’d rather have one of them (which ever) than none at all… I guess we could scan all the registered packages and see what it more common, Missing or Nothing…?

I’m pretty sure I’ve mentioned this elsewhere, but I just want to repeat that I think that T? is really ugly syntax. The first reason for this is that there are very few right unary operators in Julia. The only exception I am aware of is ', which I think is a much better case because the notation …

I like this one: const U = Union const M = Missing U{Float64, M} No magic macros Explicit Short enough

What happened to `T?`

Internals & Design

mcabbott June 20, 2019, 11:54am 2

You can write f(x::@?(Int), y::Int) = x+y with tkf’s clever macro, from this earlier discussion:

Topic		Replies	Views
Status of question mark syntax for missing values Internals & Design	6	1857	July 12, 2020
Aliases for Union{T, Nothing} and Union{T, Missing}? New to Julia	40	7562	May 10, 2019
Missing or NaN General Usage	26	12613	August 1, 2018
Idea: shortcut notation for Union{T, Nothing} General Usage	2	489	November 21, 2024
Proposed alias for union types Internals & Design question , proposal	145	5153	January 18, 2024

What happened to `T?`

Related topics