How to get the variable numbers for a julia function

General Usage
21

In a function definition, you can also use a parameter to get number of inputs but I think there are already good solutions above.

julia> function f(x::Vararg{Any, N}) where N
         @show N
         return reduce(+, x, init=false)
       end
f (generic function with 1 method)

julia> f()
N = 0
false

julia> f(1,2,3.0, 5.0, 6.0, π)
N = 6
20.141592653589793

julia> f(1,2,3.0, 5.0, 6.0, π, Int8('0'))
N = 7
68.1415926535898

julia> f(1,2,3.0, 5.0, 6.0, π, 0x0)
N = 7
20.141592653589793
1 Like
22

Thanks for the mention of devdocs - I hadn’t look at those before (at least not on purpose).
There at last I learned why the - 1 is needed above :slight_smile:
https://docs.julialang.org/en/v1/devdocs/functions/#Function-calls