recursive_iterative_fib.rb

def recursive_fib(num)
    if num <= 1
        return num
    else
        answer = recursive_fib(num - 2) + recursive_fib(num - 1)
    end
    
    return answer.abs
end

def iterative_fib(num)
    fib = [0, 1]
    
    (num - 1).times do 
        nextnum = fib[-2] + fib[-1]
        fib << nextnum
    end
    
    fib.last
end