Learn Functional Programming with Elixir/

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Battling Through to the Exit

Battling Through to the Exit

Develop our game further to include challenges for the player.

We'll cover the following...

Our game needs a challenge, or it won’t be fun. A challenge will reduce the chances of the player winning and let them feel like they overcame something when they do win.

For our challenge, we’ll implement a room with an enemy. The hero and the enemy will fight, and the first one to reach zero hit points is defeated. We need to build a list of enemies, create functions to reduce and restore character hit points, build a battle module, and create a room that can trigger a battle. Once we have a room-trigger contract, we need to follow it strictly.

The first step will be to construct a list of enemies, creating the lib/dungeon_crawl/enemies.ex file with the following code:

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defmodule DungeonCrawl.Enemies do 
  alias DungeonCrawl.Character
  def all, do: [ 
    %Character{
      name: "Ogre",
      description: "A large creature. Big muscles. Angry and hungry.", 
      hit_points: 12,
      max_hit_points: 12,
      damage_range: 3..5,
      attack_description: "a hammer"
    },
    %Character{
      name: "Orc",
      description: "A green evil creature. Wears armor and an axe.", 
      hit_points: 8,
      max_hit_points: 8,
      damage_range: 2..4,
      attack_description: "an axe"
    },
    %Character{
      name: "Goblin",
      description: "A small green creature. Wears dirty clothes and a dagger.", 
      hit_points: 4,
      max_hit_points: 4,
      damage_range: 1..2,
      attack_description: "a dagger"
    }, 
  ]
end

We’ve used the same DungeonCrawl.Character struct of the hero to create the enemies. It’s a list of suggested enemies. Feel free to create more or change the list. The next step is to create functions that permit the reduction or restoration of a character’s hit points and another function that displays the character’s current hit points. Let’s write ...