fib spec.rb

require_relative "fibonacci_solution"

describe "fibo finder" do
  
  it "it should return the nth number of the fibonacci sequence" do
    fibo_finder(0).should eq(0)
  end

  it "it should return the nth number of the fibonacci sequence" do
    fibo_finder(1).should eq(1)
  end

  it "it should return the nth number of the fibonacci sequence" do
    fibo_finder(4).should eq(3)
  end

  it "it should return the nth number of the fibonacci sequence" do
    fibo_finder(7).should eq(13)
  end

  it "it should return the nth number of the fibonacci sequence" do
    fibo_finder(10).should eq(55)
  end

end

fib.rb

# prereqs: arrays, methods, conditional logic
# create a method that returns the nth number of the fibonacci sequence
# fib sequence = 0,1,1,2,3,5,8,13 etc, assume the 1st element is 0 (the first number), the 2nd element is 1, the third element is 1
def fibo_finder(n)
  # code goes here
end

fibonacci iterative solution.rb

def fibo_finder(n)
  if n == 0
    return 0
  elsif n == 1
    return 1
  else
    sequence = [0,1]
    (n - 1).times do
      sequence << sequence[-1] + sequence[-2]
    end
  end
  return sequence.last
end