Ruby Warrior solutions. https://www.bloc.io/ruby-warrior

level_1.rb

class Player
  def play_turn(warrior)
    warrior.walk!
  end
end

level_2.rb

class Player
  def play_turn(warrior)
    if warrior.feel.enemy?
      warrior.attack!
    else
      warrior.walk!
    end
  end
end

level_3.rb

class Player
  def play_turn(warrior)
    if warrior.feel.enemy?
      warrior.attack!
    elsif warrior.health < 20
      warrior.rest!
    else
      warrior.walk!
    end
  end
end

level_4.rb

class Player
  def play_turn(warrior)
    @health ||= warrior.health
    
    if warrior.feel.enemy?
      warrior.attack!
    elsif warrior.health < 20 && !under_attack?(warrior)
      warrior.rest!
    else
      warrior.walk!
    end
    
    @health = warrior.health
  end
  
  def under_attack?(warrior)
    warrior.health < @health
  end
end

level_5.rb

class Player
  def play_turn(warrior)
    @health ||= warrior.health
    
    if warrior.feel.captive?
      warrior.rescue!
    elsif warrior.feel.enemy?
      warrior.attack!
    elsif warrior.health < 20 && !under_attack?(warrior)
      warrior.rest!
    else
      warrior.walk!
    end
    
    @health = warrior.health
  end
  
  def under_attack?(warrior)
    warrior.health < @health
  end
end

level_6.rb

class Player
  def play_turn(warrior)
    @health ||= warrior.health
    @direction ||= :backward
    
    if warrior.feel(@direction).captive?
      warrior.rescue!(@direction)
      @direction = :forward
    elsif warrior.feel(@direction).enemy?
      warrior.attack!(@direction)
    elsif warrior.health < 20 && !under_attack?(warrior)
      warrior.rest!
    elsif warrior.health < 10 && under_attack?(warrior)
      warrior.walk!(:backward)
    else
      warrior.walk!(@direction)
    end
    
    @health = warrior.health
  end
  
  def under_attack?(warrior)
    warrior.health < @health
  end
end

level_7.rb

class Player
  def play_turn(warrior)
    @health ||= warrior.health
    
    if warrior.feel.wall?
      warrior.pivot!
    elsif warrior.feel.enemy?
      warrior.attack!
    elsif warrior.health < 20 && !under_attack?(warrior)
      warrior.rest!
    elsif warrior.health < 10 && under_attack?(warrior)
      warrior.walk!(:backward)
    else
      warrior.walk!
    end
    
    @health = warrior.health
  end
  
  def under_attack?(warrior)
    warrior.health < @health
  end
end

level_8.rb

class Player
  def play_turn(warrior)
    @health ||= warrior.health
    
    if warrior.feel.captive?
      warrior.rescue!
    elsif warrior.look.any?(&:captive?)
      warrior.walk!
    elsif warrior.look.any?(&:enemy?)
      warrior.shoot!
    elsif warrior.feel.enemy?
      warrior.attack!
    elsif warrior.health < 20 && !under_attack?(warrior)
      warrior.rest!
    elsif warrior.health < 10 && under_attack?(warrior)
      warrior.walk!(:backward)
    else
      warrior.walk!
    end
    
    @health = warrior.health
  end
  
  def under_attack?(warrior)
    warrior.health < @health
  end
end

level_9.rb

class Player
  def play_turn(warrior)
    @health ||= warrior.health
    
    if warrior.feel.wall?
      warrior.pivot!
    elsif warrior.feel.captive?
      warrior.rescue!
    elsif warrior.feel.enemy?
      warrior.attack!
    elsif warrior.look.last.enemy?
      warrior.shoot!
    elsif warrior.health < 20 && !under_attack?(warrior)
      warrior.rest!
    elsif warrior.health < 10 && under_attack?(warrior)
      warrior.walk!(:backward)
    else
      warrior.walk!
    end
    
    @health = warrior.health
  end
  
  def under_attack?(warrior)
    warrior.health < @health
  end
end