A way to 'decorate' your objects in JavaScript

decorating-objects.js

var Adventurer = function(options) {
  this.name   = options.name;
  this.gender = options.gender;
  this.class  = options.class;
  this.race   = options.race;

  this.position = options.position || 'standing';

  this.effects = [];
  this.hits    = [];

  this.attributes = {};
  this.status     = {};

  return this;
};

var addPositional = function(adventurer) {
  adventurer.sleep = function() {
    adventurer.position = 'sleep';
  };

  adventurer.sit = function() {
    adventurer.position = 'sit';
  };

  adventurer.stand = function() {
    adventurer.position = 'stand';
  };

};

var addWarriorSkills = function(adventurer) {

  adventurer.bash = function(target) {
    target.hits.push({type: 'bash', damage: 25});
  };
};

var addMageSkills = function(adventurer) {
  adventurer.castSleep = function(target) {
    target.sleep();
  };

  adventurer.cast = function(spell, target) {
    var capitalize = function(word) {
      return word[0].toUpperCase() + word.slice(1, word.length);
    };

    var spellName = function(spell) {
      return [
        'cast',
        capitalize(spell)
      ].join('');
    };

    adventurer[spellName(spell)](target);
  };
};

var timmy = new Adventurer({
  name: "Timmy the Terrible",
  gender: 'male',
  class: 'warrior',
  race: 'minotaur',
  effects: [],
  position: 'standing',
  attributes: {
    strength: 18,
    intelligence: 8,
    wisdom: 8,
    charisma: 8,
    dexterity: 16
  },
  status: {
    health: 100,
    mana: 0,
    move: 100
  },
});


var allie = new Adventurer({
  name: "Allie the Awful",
  gender: 'female',
  class: 'mage',
  race: 'elf',
  effects: [],
  position: 'standing',
  attributes: {
    strength: 8,
    intelligence: 17,
    wisdom: 12,
    charisma: 8,
    dexterity: 12
  },
  status: {
    health: 100,
    mana: 120,
    move: 100
  },
});

addWarriorSkills(timmy);
addPositional(timmy);

addMageSkills(allie);
addPositional(allie);

timmy.bash(allie);
allie.cast('sleep', timmy);

console.log(timmy);
console.log(allie);