If I run example.py, I get "8" ... if run example.rb I get error: Traceback (most recent call last): 1: from ./example1.rb:12:in `<main>' ./example1.rb:3:in `times2': wrong number of arguments (given 0, expected 1) (ArgumentError)

example.py

#!/usr/bin/env python


def times2(num):
    return num * 2


def add(num1, num2, fn=None):
    sum = num1 + num2
    return fn(sum)


answer = add(1, 3, times2)
print(answer)

example.rb

#!/usr/bin/env ruby

def times2(num)
    return num * 2
end

def add(num1, num2, fn=nil)
    sum = num1 + num2
    return fn sum
end

answer = add(1, 3, times2)
puts answer

gistfile1.txt

Empty