Encapsulation Builder

Example code

class Backpack {
  constructor(owner) {
    this.owner = owner;
    this.items = [];
  }

  addItem(item) {
    this.items.push(item);
    say(item + " was added to " + this.owner + "'s backpack.");
  }

  useItem(item) {
    let index = this.items.indexOf(item);
    if (index === -1) {
      say(item + " is not in the backpack.");
    } else {
      this.items.splice(index, 1);
      say(this.owner + " used " + item + ".");
    }
  }

  showItems() {
    say("Backpack: " + this.items.join(", "));
  }
}

let bag = new Backpack("Milo");
bag.addItem("map");
bag.addItem("snack");
bag.useItem("snack");
bag.showItems();

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