stateful vs stateless react code example

Example 1: how to write statefull class in react

import React, {Component} from 'react'

class Pigeons extends Component {
  constructor() {
    super()
    this.state = {
      pigeons: []
    }
  }
  render() {
    return (
      <div>
        <p>Look at all the pigeons spotted today!</p>
        <ul>
          {this.state.pigeons.map(pigeonURL => {
            return <li><img src={pigeonURL} /></li>
          })}
        </ul>
      </div>
    )
  }
}

Example 2: stateful component vs stateless component

class Parent extends Component {
  constructor() {
    super()
    this.state = {
      books: [],
      favoriteAuthors: []
    }
  }
  render() {
    return (
      <div>
        <Books books={this.state.books} />
        <FavoriteAuthors favoriteAuthors={this.state.favoriteAuthors} />
      </div>
    )
  }
}