Allow function to ignore unsupported keyword arguments

Question

Is there a nice way of allowing a function to ignore unsupported keyword arguments?

fopts = [:kw1]
opts = Dict(:kw1=>:symb1, :kw2=>:symb2)

function f(; kw1 = :symb)
    return kw1
end

f(;opts...) will throw a METHOD ERROR

I could wrap it in something like this, but then I still need to know which kwargs f will support?

function f2(fopts; kwargs)
    f(; Dict(key=>get(opts, key, 0) for key in fopts)...)
end

Am I missing a way around this. Not that fussed if there is a performance penalty as I imagine their may need to be some kind of look up. Is there a good way of interrogating what kwargs f accepts programatically?

Answer 1

Is this what you want?

function g(; kw1 = :a, kw2 = :b, _whatever...)
    return (kw1, kw2)
end

Now it works like this:

julia> g()
(:a,:b)

julia> g(kw1 = :c)
(:c,:b)

julia> g(kw2 = :d)
(:a,:d)

julia> g(kw2 = :e, kw1 = :f, kw3 = :boo)
(:f,:e)