Composing a function with keyword arguments

[lmiq]

You can achieve that with a functor:

In Julia, how to create a function that saves its own internal state?

Or a functor? struct F state end (o::F)(x) = o.state + x f = F(1) f(2) 3 more specifically: julia> Base.@kwdef mutable struct F state = nothing end F julia> function (o::F)() if o.state == nothing o.state = 1 else o.state += 1 end end julia> f = F() F(nothing) julia> f() 1 julia> f() 2 julia> f() 3 julia> f.state # now this is part of the language, because f is an instance of F 3

Though it is probably good to be sure that’s is the best strategy for what you really want to do.