JS | 바닐라로 투두 만들기

  <div id="today"></div>

    const ERROR_MESSAGE = {
      dataDefind: 'data is not defind',
      is_array: 'data type is not array',
      type_check: 'type error'
    }

    const today = [
      {
        text: 'JS 공부하기',
        isComplete: true
      }
    ];

  function validate(data) {
    if(data === null || undefined) throw new Error(ERROR_MESSAGE.dataDefind);

    if(!Array.isArray(data)) throw new Error(ERROR_MESSAGE.is_array);

    data.map((item) => {
      if(typeof item.text !== 'string' || typeof item.isComplete !== "boolean") throw new Error(ERROR_MESSAGE.type_check)
    })

    return data;
  }


  function CreateTodoList(data) {
    this.data = validate(data);
    
    this.setState = function(nextData) {
      validate(nextData);
      this.data = nextData;
      this.render();
    };
    
    this.render = function(id) {
      const todoList = document.querySelector(`#${id}`);
      todoList.innerHTML = this.data.map((item) => item.isComplete ? `<strike>${item.text}</strike>`: `${item.text}`).join('');
    };
  }

  const todayList = new CreateTodoList(today);
  todayList.render('today');