_README.md

Ruby Warrior Solutions for RailsGirls

Red-Green-Refactoring with Ruby Warrior

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I'm placing all my solutions in this Gist. Unfortunately, I cannot monkeypatch or mix commands for better refactoring. It's the nature of the game that I must maintain control of the Player object only.

Blog About Levels 1-3

level_1.rb

# Easy use of the command to beat the level
class Player
  def play_turn(warrior)
    warrior.walk!
  end
end
  

level_2.rb

# Feel around to see if you should attack or walk
class Player
  def play_turn(warrior)
    if warrior.feel.empty?
      warrior.walk!
    else
      warrior.attack!
    end
  end
end
  
  

level_3.rb

# Guessing #15 health is best
# When it drops below, the warrior rests rather than carries on
class Player
  def play_turn(warrior)
    # feel infront
    if warrior.feel.empty?
      # decide what to do now that we can't be attacked.
      if warrior.health < 15
        warrior.rest!
      else
        warrior.walk!
      end
    else
      warrior.attack!
    end
    
  end
end
  

level_3_refactored.rb

# Moving my guess of 15 to the top, so it's easy to find and mess with
class Player
  # Keep value up top to twiddle
  MIN_HEALTH = 15
  
  def play_turn(warrior)
    if warrior.feel.empty?
      if warrior.health < MIN_HEALTH
        warrior.rest!
      else
        warrior.walk!
      end
    else
      warrior.attack!
    end
    
  end
end

level_4_basic.rb

# Store the last known health in the instance variable @last_known_health
# use this variable to see if we're taking damage
class Player
  MIN_HEALTH = 15
  
  def play_turn(warrior)
    if warrior.feel.empty?
      if warrior.health < MIN_HEALTH && (warrior.health >= @last_known_health)
        warrior.rest!
      else
        warrior.walk!
      end
    else
      warrior.attack!
    end
    
    @last_known_health = warrior.health
  end
end
  

level_4_refactored.rb

# Store the last known health in the instance variable @last_known_health
# use this variable to see if we're taking damage
class Player
  MIN_HEALTH = 15
  
  def play_turn(warrior)
    if warrior.feel.empty?
      if should_rest? warrior
        warrior.rest!
      else
        warrior.walk!
      end
    else
      warrior.attack!
    end
    
    @last_known_health = warrior.health
  end
  
  private
  
  def should_rest? warrior
    # Don't worry too much about the next line
    @last_known_health = warrior.health unless @last_known_health
    safe = warrior.health >= @last_known_health
    bad_health = warrior.health < MIN_HEALTH
    safe && bad_health
  end
end

level_5_basic.rb

# Beating level 5 was simple by using a var for the space we inspect
class Player
  MIN_HEALTH = 15
  
  def play_turn(warrior)
  
    front_space = warrior.feel
    
    if front_space.empty?
      if should_rest? warrior
        warrior.rest!
      else
        warrior.walk!
      end
    elsif front_space.captive?
      warrior.rescue!
    else
      warrior.attack!
    end
    
    @last_known_health = warrior.health
  end

  private
  
  def should_rest? warrior
    # Don't worry too much about the next line
    @last_known_health = warrior.health unless @last_known_health
    safe = warrior.health >= @last_known_health
    bad_health = warrior.health < MIN_HEALTH
    safe && bad_health
  end
end

level_6_basic_no_rescue.rb

# Level 6 gets tricky, adding need to flee!
class Player
  MIN_HEALTH = 15
  
  def play_turn(warrior)
    @last_known_health = warrior.health unless @last_known_health
    front_space = warrior.feel
    
    if front_space.empty?
      if should_flee? warrior
        warrior.walk! :backward
      elsif should_rest? warrior
        warrior.rest!
      else
        warrior.walk!
      end
    elsif front_space.captive?
      warrior.rescue!
    else
      warrior.attack!
    end
    
    @last_known_health = warrior.health
  end

  private
  
  def should_flee? warrior
    !safe?(warrior) && (warrior.health < 7) 
  end
  
  def should_rest? warrior
    bad_health = warrior.health < MIN_HEALTH
    safe?(warrior) && bad_health
  end
  
  def safe? warrior
    warrior.health >= @last_known_health
  end
end

level_6_basic_rescue.rb

# Level 6 gets a @direction var to maintain direction in all actions.
class Player
  MIN_HEALTH = 15
  FLEE_HEALTH = 7
  
  def play_turn(warrior)
    # switch to ||= like a good boy
    @last_known_health ||= warrior.health
    @direction ||= :forward
    feel_space = warrior.feel @direction
    
    if feel_space.empty?
      if should_flee? warrior
        @direction = :backward
        warrior.walk! @direction
      elsif should_rest? warrior
        warrior.rest!
      else
        warrior.walk! @direction
      end
    elsif feel_space.captive?
      warrior.rescue! @direction
    elsif feel_space.wall?
      @direction = :forward
    else
      warrior.attack!
    end
    
    @last_known_health = warrior.health
  end

  private
  
  def should_flee? warrior
    bad_health = warrior.health < FLEE_HEALTH
    !safe?(warrior) && bad_health
  end
  
  def should_rest? warrior
    bad_health = warrior.health < MIN_HEALTH
    safe?(warrior) && bad_health
  end
  
  def safe? warrior
    warrior.health >= @last_known_health
  end
end

level_7_basic.rb

# Added a single line to the last one, and it works!
class Player
  REST_HEALTH = 15
  FLEE_HEALTH = 7
  
  def play_turn(warrior)
    @last_known_health ||= warrior.health
    @direction ||= :forward
    feel_space = warrior.feel @direction
    
    
    if feel_space.empty?
      if should_flee? warrior
        @direction = :backward
        warrior.walk! @direction
      elsif should_rest? warrior
        warrior.rest!
      else
        warrior.walk! @direction
      end
    elsif feel_space.captive?
      warrior.rescue! @direction
    elsif feel_space.wall?
      @direction = :forward
      warrior.pivot!
    else
      warrior.attack!
    end
    
    @last_known_health = warrior.health
  end

  private
  
  def should_flee? warrior
    bad_health = warrior.health < FLEE_HEALTH
    !safe?(warrior) && bad_health
  end
  
  def should_rest? warrior
    bad_health = warrior.health < REST_HEALTH
    safe?(warrior) && bad_health
  end
  
  def safe? warrior
    warrior.health >= @last_known_health
  end
end

level_8_basic_no_rescue.rb

# Level 8 basic
class Player
  REST_HEALTH = 15
  FLEE_HEALTH = 7
  
  def play_turn(warrior)
    @last_known_health ||= warrior.health
    @direction ||= :forward
    feel_space = warrior.feel @direction
    glance = warrior.look @direction
    
    if glance.any? { |space| space.enemy? }
      warrior.shoot!
    elsif feel_space.empty?
      if should_flee? warrior
        @direction = :backward
        warrior.walk! @direction
      elsif should_rest? warrior
        warrior.rest!
      else
        warrior.walk! @direction
      end
    elsif feel_space.captive?
      warrior.rescue! @direction
    elsif feel_space.wall?
      @direction = :forward
      warrior.pivot!
    else
      warrior.attack!
    end
    
    @last_known_health = warrior.health
  end

  private
  
  def should_flee? warrior
    bad_health = warrior.health < FLEE_HEALTH
    !safe?(warrior) && bad_health
  end
  
  def should_rest? warrior
    bad_health = warrior.health < REST_HEALTH
    safe?(warrior) && bad_health
  end
  
  def safe? warrior
    warrior.health >= @last_known_health
  end
end

level_8_basic_rescue.rb

# Level 8 with rescue!
class Player
  REST_HEALTH = 15
  FLEE_HEALTH = 7
  MAX_GLANCE = 4
  
  def play_turn(warrior)
    @last_known_health ||= warrior.health
    @direction ||= :forward
    feel_space = warrior.feel @direction
    glance = warrior.look @direction
    
    if clear_shot? warrior
      warrior.shoot!
    elsif feel_space.empty?
      if should_flee? warrior
        @direction = :backward
        warrior.walk! @direction
      elsif should_rest? warrior
        warrior.rest!
      else
        warrior.walk! @direction
      end
    elsif feel_space.captive?
      warrior.rescue! @direction
    elsif feel_space.wall?
      @direction = :forward
      warrior.pivot!
    else
      warrior.attack!
    end
    
    @last_known_health = warrior.health
  end

  private
  
  def clear_shot? warrior
    glance = warrior.look @direction
    distance_to_enemy = glance.index { |space| space.enemy? == true } || MAX_GLANCE
    distance_to_captive = glance.index { |space| space.captive? == true } || MAX_GLANCE
    distance_to_enemy < distance_to_captive
  end
  
  def should_flee? warrior
    bad_health = warrior.health < FLEE_HEALTH
    !safe?(warrior) && bad_health
  end
  
  def should_rest? warrior
    bad_health = warrior.health < REST_HEALTH
    safe?(warrior) && bad_health
  end
  
  def safe? warrior
    warrior.health >= @last_known_health
  end
end

level_9_basic_rescue.rb

# Everything with rescue!
class Player
  REST_HEALTH = 15
  FLEE_HEALTH = 7
  MAX_GLANCE = 4
  
  def play_turn(warrior)
    @last_known_health ||= warrior.health
    @direction ||= :forward
    feel_space = warrior.feel @direction
    
    if clear_shot? warrior
      warrior.shoot!
    elsif feel_space.empty?
      if should_flee? warrior
        @direction = :backward
        warrior.walk! @direction
      elsif should_rest? warrior
        warrior.rest!
      else
        warrior.walk! @direction
      end
    elsif feel_space.captive?
      warrior.rescue! @direction
    elsif feel_space.wall?
      @direction = :forward
      warrior.pivot!
    else
      warrior.attack!
    end
    
    @last_known_health = warrior.health
  end

  private
  
  def clear_shot? warrior
    glance = warrior.look @direction
    distance_to_enemy = glance.index { |space| space.enemy? == true } || MAX_GLANCE
    distance_to_captive = glance.index { |space| space.captive? == true } || MAX_GLANCE
    safe?(warrior) && distance_to_enemy < distance_to_captive
  end
  
  def should_flee? warrior
    bad_health = warrior.health < FLEE_HEALTH
    !safe?(warrior) && bad_health
  end
  
  def should_rest? warrior
    bad_health = warrior.health < REST_HEALTH
    safe?(warrior) && bad_health
  end
  
  def safe? warrior
    warrior.health >= @last_known_health
  end
end