How to acces the value of a Optional-Positional argument (~ argument) ?

I want a function like this:

function foo(a, b, ~)
    foo2(a, b, ~)  % two ~ are same
end

However it's not allowed. So how to access the value of ~, or find another way to pass it to foo2?

Answer 1

[Matt J]

The ~ doesn't mean the input is optional. It means the function doesn't care what it is. Since your function does care, use a named argument.

function foo(a, b, c)
    foo2(a, b, c)  
end