frontend-bootcamp/step1-06/exercise/src/TodoApp.tsx

import React from 'react';
import { TodoFooter } from './components/TodoFooter';
import { TodoHeader } from './components/TodoHeader';
import { TodoList } from './components/TodoList';

export class TodoApp extends React.Component<any, any> {
  constructor(props) {
    super(props);
    this.state = {
      todos: {
        '04': {
          label: 'Todo 4',
          completed: true
        },
        '03': {
          label: 'Todo 3',
          completed: false
        },
        '02': {
          label: 'Todo 2',
          completed: false
        },
        '01': {
          label: 'Todo 1',
          completed: false
        }
      },
      filter: 'all'
    };
  }
  render() {
    const { filter, todos = [] } = this.state;
    return (
      <div>
        <TodoHeader filter={filter} />
        <TodoList todos={todos} filter={filter} />
        <TodoFooter todos={todos} />
      </div>
    );
  }
}