There is no need to do this in Julia; you can simply initialize in the
default argument.
function f(x; y=[x, x, x])
@show x y
end
then
julia> f(1)
x = 1
y = [1,1,1]
because in Julia, unlike Python, the initialization is done at calltime
instead of function definition time.
On Friday, November 4, 2016 at 2:37:38 PM UTC-4, Alex wrote:
>
> Hi all,
>
> I need to specify function parameter by default value None/Nothing like
> in Python, so that if it is not initialized during the function call I
> do it inside the function.
>
> I read corresponding section in the FAQ:
>
> http://docs.julialang.org/en/release-0.5/manual/faq/#nothingness-and-missing-values
>
>
>
> And I still don't understand what is the proper way of doing this.
>
> Should I do it like this?
>
>
> ```
> function foo(x1,x2; z = Nullable{Int64}())
> if isnull(z)
> ...
> else
> ...
> end
> end
> ```
>
> or in another way?
>
>
> --
> BR,
> Alex
>
