week 2 independent challenge - done in ruby

Robot Challenge

class Robot

  def initialize()
    @x = 0
    @y = 0
    @current_direction = "N"
    @direction_array = ["N","E","S","W"]
  end

  def returns_to_origin(directions)
    if directions==""
      p "true"
    else
      directions_array = directions.split('')
      calculate_movement(directions_array)
    end
  end

  def calculate_movement(directions_array)
    directions_array.map do |letter|
       if letter == "G"
         g_movement
       elsif letter=="L" || letter== "R"
         turning_movement(letter)
       end
     end
     if @x == 0 && @y == 0
       p "true"
     else
       p "false"
     end
  end

  def g_movement
    if @current_direction == "N"
      @y+=1
    elsif @current_direction =="E"
      @x+=1
    elsif @current_direction == "S"
      @y-=1
    elsif @current_direction == "W"
      @x-=1
    end
  end
  #
  def turning_movement(letter)
    if letter == "R"
      index = @direction_array.index(@current_direction)
      rotated_array = @direction_array.rotate(1)
      @current_direction = rotated_array[index]
    else
      index = @direction_array.index(@current_direction)
      rotated_array = @direction_array.rotate(-1)
      @current_direction = rotated_array[index]
    end
  end
end


robot = Robot.new()
robot.returns_to_origin("GRGRGRG")
robot.returns_to_origin("GRGRLL")
robot.returns_to_origin("")
robot.returns_to_origin("GRGGRGGRGRGLG")
robot.returns_to_origin("GRGRGGLGRGRGRG")