Rotate left : String class Extension « String « Ruby

Rotate left


class String
  def rotate_left(n=1)
    n=1 unless n.kind_of? Integer
    n.times do
      char = self.shift
      self.push(char)
    end
    self
  end
  def push(other)
    newself = self + other.to_s.dup.shift.to_s
    self.replace(newself)
  end
  def shift
    return nil if self.empty?
    item=self[0]
    self.sub!(/^./,"")
    return nil if item.nil?
    item.chr
  end
end

a = "this is a test"

puts a.rotate_left

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