Solutions to some of Codility Lessons

codility_lessons.rb

# === [Lesson 2: Arrays] - CyclicRotation
# === Program v1 (recursive)

def solution(a, k)
  return a if k == 0 || a.length == 0
  a = a.unshift(a.delete_at(a.length - 1))
  k -= 1
  return solution(a, k)
end

# === Program v2 (iterative)

def solution(a, k)  
  while k > 0 && a.length > 0
    a = a.unshift(a.delete_at(a.length - 1))
    k -= 1
  end
  return a
end