[Design Pattern] 9. Module Pattern

function AnimalContainter () {
  const container = [];

  function addAnimal (name) {
    container.push(name);
  }

  function getAllAnimals() {
    return container;
  }

  function removeAnimal(name) {
    const index = container.indexOf(name);
    if(index < 1) {
      throw new Error('Animal not found in container');
    }
    container.splice(index, 1)
  }

  return {
    add: addAnimal,
    get: getAllAnimals,
    remove: removeAnimal
  }
}

  const container = AnimalContainter();

  container.add('Hen')
  container.add('Goat')
  container.add('Sheep')

  console.log(container.get()) // ["Hen", "Goat", "Sheep"]
  container.remove('Sheep')
  console.log(container.get()) // ["Hen", "Goat"]

 

 

AnimalContainter에서 반환(리턴)된 변수 / 함수만 외부에서 접근하여 사용가능