Alias a struct using it's own field

General Usage
3

If what you mean by “alias” is to customize the way Dog instances are printed, then you can define a new, specific method for Base.show. This is explained in mode details in the Custom pretty-printing section of the manual

julia> struct Dog
           name
           age
       end

julia> array = [Dog(:Jack, 2), Dog(:Max, 3)]
2-element Vector{Dog}:
 Dog(:Jack, 2)
 Dog(:Max, 3)

julia> function Base.show(io::IO, mime::MIME"text/plain", dog::Dog)
           show(io, mime, dog.name)
       end

julia> array
2-element Vector{Dog}:
 :Jack
 :Max
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