Consider the following Julia code julia> a = Any[1, 2, 3.0] 3-element Vector{Any}: 1 2 3.0 julia> map(x->x, a) 3-element Vector{Real}: 1 2 3.0 Here I abused map to convert an array of Any to the narrowest type Real that all elements belong to. Is there a less hacky way to do this, while ret…

You can broadcast identity. [image] Is there a coalesce function for other types? General Usage I found this nice function called coalesce and now I am wondering if there is a more general one. Is there a function like coalesce which can specify the missing value/type. a…

I just came across this and thought it’s worth benchmarking. Looks like map is better suited for this: I had thought map might be the best approach, but I looked at the code it produces: julia> @code_typed map(identity, a) CodeInfo( 1 ─ %1 = %new(Generator{Vector{Any}, typeof(identity)}, identity,…

It would be nice if Base included something like identity(x::Vector) = identity.(x) My usage: Using SplitApplyCombine.group to split vector of deals into a dictionary of vectors of deal subtypes. Then apply Value to each vector. @> group( typeof, deals ) Value.() But the vectors produced…

It’s pretty simple to add identity.(...) explicitly before calling Value(...), no need to define new methods: using DataPipes # not sure which piping package you used, here showing example with DataPipes @p group(typeof, deals) |> map(Value(identity.(_))) # or @p group(typeof, deals) .|> Value.(i…

f(::Pair{Symbol,Int64}) = "pair_Symbol_Int64" f(::Pair{Symbol,String}) = "pair_Symbol_String" f(::Pair) = "pair" [ Pair(:x,"a"), Pair(:y,2.3)][1] |> f returns pair. I’d like to return pair_Symbol_String Is this possible ?

julia> Any[ Pair(:x,"a"), Pair(:y,2.3)][1] |> f "pair_Symbol_String"

x = [Pair(:a,1),Pair(:b,"s")] y = Any[Pair(:a,1),Pair(:b,"s")] f.( y ) #works f.( convert(Vector{Any}, x) ) #doesn't work how can I do it with applying a function to x ? Any[x...] isn’t the same as Any[Pair(:a,1),Pair(:b,"s")]

You need to repackage them into better types, e.g. julia> f.(map(p -> Pair(p...), x)) 2-element Vector{String}: "pair_Symbol_Int64" "pair_Symbol_String"

This issue is specific to Pair and a few other promotable types. IMO, it is pretty unusual that simply putting an object into array changes it: julia> p1 = Pair(:x,"a") julia> p2 = Pair(:y,2.3) julia> [p1, p2] julia> [p1, p2][1] === p1 false But that’s how it is defined…

I mean you can prevent it, but you need to define all the Pairs with a compatible type before. julia> p1 = Pair{Symbol,Any}(:x,"a") Pair{Symbol, Any}(:x, "a") julia> p2 = Pair{Symbol,Any}(:y,2.3) Pair{Symbol, Any}(:y, 2.3) julia> [p1, p2][1] === p1 true

How to convert Vector{Any} to a narrower type?

General Usage

feanor12 May 1, 2021, 12:29pm 2

You can broadcast identity.

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How to convert Vector{Any} to a narrower type?

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