Recursion in Ruby

Question

Can anyone explain this code please?

def fib(num)
if num < 2
num
else
fib(num-1) + fib (num - 2)
end
end

puts fib(4)

Answer 1

Because you have marked 4 for "num" variable, if 4 is not less than 2, so, Ruby go to add the 2 methods (num - 1) and (num + 2).

Answer 2

// He's printing "3" :
https://code.sololearn.com/cfgSVqQD22G3/?ref=app

Answer 3

You ruby Program are compute the fibonacci number of the giv'n number.
Please look at wikipedia for more informations

Answer 4

I want an example of Ruby