Function prototype: Difference between revisions

 

In the following example, the 'factorial' function is recursive and so needs a forward declaration. However, even though the function takes a single argument, no prior information about that is needed or possible. There is an example of mutual recursion protoyping in the [[Mutual_recursion#Wren]] task.

 

factorial = Fn.new { |n| (n <= 1) ? 1 : factorial.call(n-1) * n }