import React, { Component } from 'react';

class List extends Component {
  constructor(props) {
    super(props);
    this.state = {
      items: [],
    };
    this.handleAddItem = this.handleAddItem.bind(this);
  }

  handleAddItem(event) {
    event.preventDefault();
    this.setState({
      items: [...this.state.items, event.target.value],
    });
  }

  render() {
    return (
      <div>
        <h1>List</h1>
        <ul>
          {this.state.items.map(item => (
            <li key={item}>{item}</li>
          ))}
        </ul>
        <form onSubmit={this.handleAddItem}>
          <input type="text" />
          <button type="submit">Add</button>
        </form>
      </div>
    );
  }
}

export default List;