Project Summary

This project is geared towards helping you improve your familiarity with React hooks and will function similarly to the original React Drills. We will provided minimal guidance compared to most afternoon projects that offer detailed instructions. When you first go through these set of problems, you may need to look at solutions for help. The goal, however, should be to get to the point where you can complete all sets of problems without any help from solutions and/or mentors.

The solutions provided in this project are just one way you can accomplish the project. If you are curious if your solution is "correct", you can ask a mentor to compare your answer to the ones we are providing.

Challenge

Once you get to the point where you no longer have to look at the solutions and/or ask mentors for help, time yourself to see how long it takes you to complete all of these sets. After your first time, try to beat that time at least twice. The project is called React Drills for a reason! Repetition will help solidify these React concepts.

Setup

To help speed up the process of moving from app to app we have provided a bunch of app-#/ folders that have been created using the create-react-app CLI. That way you just have to run npm install instead of waiting for create-react-app.

Run npm install in each app-#/ folder before starting the
- You can either run npm install for each app-#/ before starting app one or just remember to run npm install as you move from app to app

You can then test your work for each app, as you develope a solution, by running npm start from each app-#/ folder.

App #1 - useState

Create an application that displays a list of todos and an interface to add a new todo. You will need a few components: App.js, List.js, Todo.js, and AddTodo.js. List.js will be responsible for rendering a mapped list of todos which will be passed as props from App.js. AddTodo.js will be responsible for rendering the necessary input and button to make this interface work.

app-1/src/App.js

import React, { useState } from 'react'
import List from './components/List'
import AddTodo from './components/AddTodo'
import './App.css'

function App() {
  const [todos, setTodos] = useState([])

  function addTodo(item) {
    const newTodos = [...todos, item]
    setTodos(newTodos)
  }

  return (
    <div className="App">
      <AddTodo addTodo={addTodo} />
      <List list={todos} />
    </div>
  )
}

export default App

app-1/src/List.js

import React from 'react'
import Todo from './Todo'

const List = (props) => {
  return (
    <div>
      {props.list.map((item, index) => {
        return <Todo item={item} key={index} />
      })}
    </div>
  )
}
export default List

app-1/src/Todo.js

import React from 'react'

const Todo = (props) => {
  return <h2>{props.item}</h2>
}
export default Todo

app-1/src/AddTodo.js

import React, { useState } from 'react'

const AddTodo = (props) => {
  const [userInput, setUserInput] = useState('')

  function handleAddTodo(e) {
    e.preventDefault()
    props.addTodo(userInput)
    setUserInput('')
  }

  return (
    <form onSubmit={handleAddTodo}>
      <input
        placeholder="Add a todo!"
        value={userInput}
        onChange={(e) => setUserInput(e.target.value)}
      />
      <button>Submit</button>
    </form>
  )
}
export default AddTodo

App #2 - useState, useEffect

Create an application that will use axios to hit an api of your choice (pokeapi, swapi, Cat Facts are all great choices. You can also find a large selection of free apis here). Use the results from the api to display a list of data (pokemon, Star Wars characters, cat facts, etc.). Try to use at least 2 components to practice passing props.

Using pokeapi:

app-2/src/App.js

import React, { useState, useEffect } from 'react'
import axios from 'axios'
import ListItem from './components/ListItem'
import './App.css'

function App() {
  const [list, setList] = useState([])

  useEffect(() => {
    axios.get('https://pokeapi.co/api/v2/pokemon').then((res) => {
      setList(res.data.results)
    })
  }, [])

  return (
    <div className="App">
      {list.map((element, index) => {
        return <ListItem name={element.name} key={index} />
      })}
    </div>
  )
}

export default App

app-2/src/ListItem.js

import React from 'react'

const ListItem = (props) => {
  return <h2>{props.name}</h2>
}
export default ListItem

App-3

Create an app that hits the pokeapi and displays a list of pokemon. Use react-router-dom to be able to click on any of the displayed pokemon and link to a view that shows more detailed information about that specific pokemon. You will need the following components: App.js, PokemonList.js, Pokemon.js in addition to your routes.js file.

app-3/src/index.js

import React from 'react'
import ReactDOM from 'react-dom'
import './index.css'
import App from './App'
import reportWebVitals from './reportWebVitals'
import { HashRouter } from 'react-router-dom'

ReactDOM.render(
  <React.StrictMode>
    <HashRouter>
      <App />
    </HashRouter>
  </React.StrictMode>,
  document.getElementById('root')
)

app-3/src/App.js

import routes from './routes'
import './App.css'

function App() {
  return <div className="App">{routes}</div>
}

export default App

app-3/src/routes.js

import React from 'react'
import { Switch, Route } from 'react-router-dom'
import Pokemon from './Pokemon'
import PokemonList from './PokemonList'

export default (
  <Switch>
    <Route exact path="/" component={PokemonList} />
    <Route path="/pokemon/:name" component={Pokemon} />
  </Switch>
)

app-3/src/PokemonList.js

import React, { useState, useEffect } from 'react'
import { Link } from 'react-router-dom'
import axios from 'axios'

const PokemonList = (props) => {
  const [list, setList] = useState([])

  useEffect(() => {
    axios.get('https://pokeapi.co/api/v2/pokemon').then((res) => {
      setList(res.data.results)
    })
  }, [])

  return (
    <div>
      {list.map((pokemon) => {
        return (
          <Link key={pokemon.url} to={`/pokemon/${pokemon.name}`}>
            <h2>{pokemon.name}</h2>
          </Link>
        )
      })}
    </div>
  )
}
export default PokemonList

app-3/src/Pokemon.js