Article: Composition Alone Can't Replace Inheritance - classic composition

classicComposition.js

class MonsterBehaviors {
  #dropLoot
  constructor({ dropLoot }) {
    this.#dropLoot = dropLoot
  }

  attack() {
    playHurtAnimation()
  }

  die() {
    userInventory.add(this.#dropLoot())
    removeFromUi(this)
  }
}

export class Slime {
  #monsterBehaviors
  constructor() {
    this.#monsterBehaviors = new MonsterBehaviors({
      dropLoot: () => this.dropLoot(),
    })
  }

  dropLoot() {
    return [new SlimeBall()]
  }

  attack() {
    this.#monsterBehaviors.attack()
  }

  die() {
    return this.#monsterBehaviors.die()
  }
}

export class Skeleton { ... }

export class Clown { ... }