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1
.gitignore vendored

@ -4,3 +4,4 @@ component.md
draft draft

@ -826,9 +826,11 @@ In next section, we will cover state which is the heart of React. State allows R
2. What is inheritance and how do you make a child from a parent class? 2. What is inheritance and how do you make a child from a parent class?
3. What is class based React component ? 3. What is class based React component ?
4. What is the difference between functional React component and class based React component ? 4. What is the difference between functional React component and class based React component ?
5. What is the use cases of class based component ? 5. When do we need to use class based components instead of functional components
6. What is React life cycle ? (not covered yet) ? 6. What is the use cases of class based component ?
7. What is state in React ? 7. Which type of component do use most frequently ? functional or class-based component
8. What is React life cycle ? (not covered yet) ?
9. What is state in React ? (not covered yet)
## Exercises: Level 2 ## Exercises: Level 2

@ -500,7 +500,7 @@ I believe that now you have a very good understanding of state. After this, we w
![Change Background](../images/08_day_changing_background_exercise.gif) ![Change Background](../images/08_day_changing_background_exercise.gif)
2. After long time of lock down you may think of travelling and you do not know where to go. Then make use of this random country selector to select your holiday destination. 2. After long time of lock down, you may think of travelling and you do not know where to go. You may be interested to develop a random country selector that selects your holiday destination.
![Change Background](../images/08_day_select_country_exercise.gif) ![Change Background](../images/08_day_select_country_exercise.gif)

@ -764,16 +764,16 @@ ReactDOM.render(<App />, rootElement)
1. What is conditional rendering? 1. What is conditional rendering?
2. How do you implement conditional rendering? 2. How do you implement conditional rendering?
3. Which method of conditional rendering do you prefer? 3. Which method of conditional rendering do you prefer to use?
### Exercises: Level 2 ### Exercises: Level 2
1. Make a single page application which changes the body of the background based on the time of the day(Autumn, Winter, Spring, Summer) 1. Make a single page application which changes the body of the background based on the season of the year(Autumn, Winter, Spring, Summer)
2. Make a single page application which change the body of the background based on the time of the day(Morning, Noon, Evening, Night) 2. Make a single page application which change the body of the background based on the time of the day(Morning, Noon, Evening, Night)
### Exercises: Level 3 ### Exercises: Level 3
Coming 1. Fetching data takes some amount of time. A user has to wait until the data get loaded. Implement a loading functionality of a data is not fetched yet. You can simulate the delay using setTimeout.
🎉 CONGRATULATIONS ! 🎉 🎉 CONGRATULATIONS ! 🎉

@ -604,8 +604,8 @@ Well done. Time to do some exercises for your brain and muscles.
## Exercises:Level 1 ## Exercises:Level 1
1. What is the importance of React Folder Structure and File Naming 1. What is the importance of React Folder Structure and File Naming
2. How do we export file 2. How do you export file
3. How do we import file 3. How do you import file
4. Make a component of module and export it as named or default export 4. Make a component of module and export it as named or default export
5. Make a component or module and import it 5. Make a component or module and import it
6. Change all the components you have to different folder structure 6. Change all the components you have to different folder structure

@ -930,16 +930,15 @@ ReactDOM.render(<App />, rootElement)
8. What event type do you use to listen changes on an input field? 8. What event type do you use to listen changes on an input field?
9. What is the value of a checked checkbox? 9. What is the value of a checked checkbox?
10. When do you use onChange, onBlur, onSubmit? 10. When do you use onChange, onBlur, onSubmit?
11. What is the purpose of write e.preventDefault() inside the submit handler method? 11. What is the purpose of writing e.preventDefault() inside the submit handler method?
12. How do you bind data in React? The first input field example is data binding in React. 12. How do you bind data in React? The first input field example is data binding in React.
13. What is validation? 13. What is validation?
14. What is the event type we use to listen when an input changes? 14. What is the event type you use to listen when an input changes?
15. What are event types we use to validate an input? 15. What are event types do you use to validate an input?
## Exercises: Level 2 ## Exercises: Level 2
1. Validate the form given above (a gif image or a video will be provided later). First try to validate without using any library then try it with validator.js. 1. Validate the form given above (a gif image or a video will be provided later). First try to validate without using any library then try it with [validator.js](https://www.npmjs.com/package/validator).
2. Coming ..
## Exercises: Level 3 ## Exercises: Level 3

@ -23,8 +23,6 @@
- [Getting multiple input data from form](#getting-multiple-input-data-from-form) - [Getting multiple input data from form](#getting-multiple-input-data-from-form)
- [Exercises](#exercises) - [Exercises](#exercises)
- [Exercises: Level 1](#exercises-level-1) - [Exercises: Level 1](#exercises-level-1)
- [Exercises: Level 2](#exercises-level-2)
- [Exercises: Level 3](#exercises-level-3)
# Uncotrolled Components # Uncotrolled Components
@ -174,14 +172,6 @@ Most of the time we use controlled input instead of uncontrolled input. In case
9. When do you use controlled input? 9. When do you use controlled input?
10. Do you use a controlled or uncontrolled input to validate form input fields? 10. Do you use a controlled or uncontrolled input to validate form input fields?
## Exercises: Level 2
coming
## Exercises: Level 3
Coming
🎉 CONGRATULATIONS ! 🎉 🎉 CONGRATULATIONS ! 🎉
[<< Day 12](../12_Day_Forms/12_forms.md) | [Day 14 >>]() [<< Day 12](../12_Day_Forms/12_forms.md) | [Day 14 >>]()

@ -14,7 +14,7 @@
</div> </div>
[<< Day 13](../13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input.md) | [Day 15 >>]() [<< Day 13](../13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input.md) | [Day 15 >>](../15_Third_Party_Packages/15_third_party_packages.md)
![30 Days of React banner](../images/30_days_of_react_banner_day_14.jpg) ![30 Days of React banner](../images/30_days_of_react_banner_day_14.jpg)
@ -453,6 +453,54 @@ const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement) ReactDOM.render(<App />, rootElement)
``` ```
For instance, if we want to stop doing challenge after 30 days we can increment the day from 1 to 30 and we can block the application at day 30.
Look the example.
```js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
class App extends Component {
constructor(props) {
super(props)
console.log('I am the constructor and I will be the first to run.')
this.state = {
firstName: 'John',
day: 1,
}
}
shouldComponentUpdate(nextProps, nextState) {
console.log(nextProps, nextState)
console.log(nextState.day)
if (nextState.day > 31) {
return false
} else {
return true
}
}
// the doChallenge increment the day by one
doChallenge = () => {
this.setState({
day: this.state.day + 1,
})
}
render() {
return (
<div className='App'>
<h1>React Component Life Cycle</h1>
<button onClick={this.doChallenge}>Do Challenge</button>
<p>Challenge: Day {this.state.day}</p>
{this.state.congratulate && <h2>{this.state.congratulate}</h2>}
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
### render ### render
As we have mentioned it on the mounting phase of the component, the render() method is called when a component gets updated. It has to re-render the HTML to the DOM, with the new changes. As we have mentioned it on the mounting phase of the component, the render() method is called when a component gets updated. It has to re-render the HTML to the DOM, with the new changes.
@ -490,6 +538,63 @@ const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement) ReactDOM.render(<App />, rootElement)
``` ```
Let's use the above two life cycle methods together.
```js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
class App extends Component {
constructor(props) {
super(props)
console.log('I am the constructor and I will be the first to run.')
this.state = {
day: 1,
congratulate: '',
}
}
shouldComponentUpdate(nextProps, nextState) {
console.log(nextProps, nextState)
console.log(nextState.day)
if (nextState.day > 31) {
return false
} else {
return true
}
}
doChallenge = () => {
this.setState({
day: this.state.day + 1,
})
}
componentDidUpdate(prevProps, prevState) {
if (prevState.day == 30) {
this.setState({
congratulate: 'Congratulations,Challenge has been completed',
})
}
console.log(prevState, prevProps)
}
render() {
return (
<div className='App'>
<h1>React Component Life Cycle</h1>
<h1>Calling API</h1>
<button onClick={this.doChallenge}>Do Challenge</button>
<p>Challenge: Day {this.state.day}</p>
{this.state.congratulate && <h2>{this.state.congratulate}</h2>}
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
## Unmounting ## Unmounting
The final phase in the lifecycle of a component is unmounting. The unmounting phase removes component from the DOM. The final phase in the lifecycle of a component is unmounting. The unmounting phase removes component from the DOM.
@ -505,15 +610,19 @@ The componentWillUnmount method is the only built-in method that gets called whe
4. What does mounting means? 4. What does mounting means?
5. What does updating means 5. What does updating means
6. What does unmounting means? 6. What does unmounting means?
7. What is the most common built-in mounting life cycle method 7. What is the most common built-in mounting life cycle method?
8. 8. What are the mounting life cycle methods?
9. What are the updating life cycle methods?
10. What is the unmounting life cycle method?
## Exercises: Level 2 ## Exercises: Level 2
## Exercises: Level 3 Coming
🎉 CONGRATULATIONS ! 🎉 ## Exercises: Level 3
[<< Day 13](../13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input.md) | [Day 15 >>]() Coming
🎉 CONGRATULATIONS ! 🎉
[<< Day 13](../13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input.md) | [Day 15 >>](../15_Third_Party_Packages/15_third_party_packages.md)

@ -0,0 +1,451 @@
<div align="center">
<h1> 30 Days Of React:Third Party Packages</h1>
<a class="header-badge" target="_blank" href="https://www.linkedin.com/in/asabeneh/">
<img src="https://img.shields.io/badge/style--5eba00.svg?label=LinkedIn&logo=linkedin&style=social">
</a>
<a class="header-badge" target="_blank" href="https://twitter.com/Asabeneh">
<img alt="Twitter Follow" src="https://img.shields.io/twitter/follow/asabeneh?style=social">
</a>
<sub>Author:
<a href="https://www.linkedin.com/in/asabeneh/" target="_blank">Asabeneh Yetayeh</a><br>
<small> October, 2020</small>
</sub>
</div>
[<< Day 14](../14_Day_Component_Life_Cycles/14_component_life_cycles.md) | [Day 16 >>]()
![30 Days of React banner](../images/30_days_of_react_banner_day_15.jpg)
- [Third Party Packages](#third-party-packages)
- [NPM or Yarn](#npm-or-yarn)
- [node-sass](#node-sass)
- [CSS modules](#css-modules)
- [axios](#axios)
- [react-icons](#react-icons)
- [moment](#moment)
- [styled-components](#styled-components)
- [reactstrap](#reactstrap)
- [lodash](#lodash)
- [Exercises](#exercises)
- [Exercises: Level 1](#exercises-level-1)
- [Exercises: Level 2](#exercises-level-2)
- [Exercises: Level 3](#exercises-level-3)
# Third Party Packages
There are more than 1.4M JavaScript packages on npm registry. By now there is a package almost for every kind of problem. We do not have to create the wheel instead we have to know how to use the wheel. In this section, we will learn how to use npm packages and also we will implement most common package for React applications. As of October 10, 2020, the npm registry popular packages, total number of packages, downloads per week and downloads per month seems as shown below.
![NPM packages](../images/npm_package_day_15.png)
In one way or the other you many need the following packages in your React applications. Specially node-sass, moment and axios are important for some projects.
- [node-sass](https://www.npmjs.com/package/node-sass)
- [moment](https://www.npmjs.com/package/moment)
- [axios](https://www.npmjs.com/package/axios)
- [react-icons](https://react-icons.github.io/react-icons/)
- [styled-components](https://styled-components.com/)
- [reactstrap](https://reactstrap.github.io/)
- [lodash](https://www.npmjs.com/package/lodash)
- [uuid](https://www.npmjs.com/package/uuid)
## NPM or Yarn
You can use either npm or yarn to install packages. If you want to use [yarn](https://yarnpkg.com) you have install it separately. I would recommend you to stick in one of the package. Don't use both package management tools in one application at the same time.
Let's see how to install packages to an application. First, we go to the project directory and write the following command.
```sh
// syntax, we can use i or install
npm i package-name
// or
yarn add package-name
```
### node-sass
Sass is a CSS preprocess which allows to write CSS function, nesting and many more. Let's install node-sass to make use of the power of Sass.
Using npm:
```sh
Asabeneh@DESKTOP-KGC1AKC MINGW64 ~/Desktop/30-days-of-react$ npm install node-sass
```
Using yarn:
```sh
Asabeneh@DESKTOP-KGC1AKC MINGW64 ~/Desktop/30-days-of-react$ yarn add node-sass
```
After installing node-sass you can start using Sass in React. Create a styles folder and inside this folder create test.scss. Import this file to the component you are working or index.js. You don't need import the node-sass to the component.
```css
/* ./styles/header.scss */
header {
background-color: #61dbfb;
padding: 25;
padding: 10px;
margin: 0;
}
```
```js
// Header.js
import React from 'react'
import './styles/header.scss
const Header = () = (
<header>
<div className='header-wrapper'>
<h1>30 Days Of React</h1>
<h2>Getting Started React</h2>
<h3>JavaScript Library</h3>
<p>Instructor: Asabeneh Yetayeh</p>
<small>Oct 15, 2020</small>
</div>
</header>
)
export default Header
```
```js
// App.js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
import './styles/header.scss
class App extends Component {
render() {
return (
<div className='App'>
<Header />
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
### CSS modules
In addition to Sass, it is good to know how to use CSS modules in React. We do not have to install a separate package for a CSS module to use CSS module in React applications. CSS module can be used with Pure CSS or with Sass. The naming convention for CSS module is a specific name followed by dot and module(test.module.css or test.module.scss)
Naming:
```js
// naming for Sass
// naming for CSS
;[name].module.scss[name].module.css
```
```css
/* ./styles/header.module.scss */
.header {
background-color: #61dbfb;
padding: 25;
padding: 10px;
margin: 0;
}
.header-wrapper {
font-weight:500
border: 5px solid orange;
}
```
```js
// Header.js
import React from 'react'
import headerStyles from './styles/header.module.scss
// We can all destructure the class name
const {header, headerWrapper} = headerStyles
const Header = () = (
<header className = {headerStyles.header}>
<div className={headerStyles.headerWrapper}>
<h1>30 Days Of React</h1>
<h2>Getting Started React</h2>
<h3>JavaScript Library</h3>
<p>Instructor: Asabeneh Yetayeh</p>
<small>Oct 15, 2020</small>
</div>
</header>
)
export default Header
```
```js
// App.js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
import './styles/header.scss
class App extends Component {
render() {
return (
<div className='App'>
<Header />
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
### axios
Axios is a JavaScript library which can make HTTP requests to fetch data. In this section we will see on a get request. However, it is possible to do all the request types using [axios](https://github.com/axios/axios) (GET, POST, PUT, PATCH, DELETE).
Using npm:
```sh
Asabeneh@DESKTOP-KGC1AKC MINGW64 ~/Desktop/30-days-of-react$ npm install axios
```
Using yarn:
```sh
Asabeneh@DESKTOP-KGC1AKC MINGW64 ~/Desktop/30-days-of-react$ yarn add axios
```
```js
import React, { Component } from 'react'
// axios is a package which
// send requests to a server to fetch data
import axios from 'axios'
import ReactDOM from 'react-dom'
class App extends Component {
state = {
data: [],
}
componentDidMount() {
const API_URL = 'https://restcountries.eu/rest/v2/all'
axios
.get(API_URL)
.then((response) => {
this.setState({
data: response.data,
})
})
.catch((error) => {
console.log(error)
})
}
renderCountries = () => {
return this.state.data.map((country) => {
const languageOrLanguages =
country.languages.length > 1 ? 'Langauges' : 'Language'
const formatLanguages = country.languages
.map(({ name }) => name)
.join(', ')
return (
<div>
<div>
{' '}
<img src={country.flag} alt={country.name} />{' '}
</div>
<div>
<h1>{country.name}</h1>
<p>Capital: {country.capital}</p>
<p>
{languageOrLanguages}: {formatLanguages}
</p>
<p>Population: {country.population}</p>
</div>
</div>
)
})
}
render() {
return (
<div className='App'>
<h1>Fetching Data Using Axios</h1>
<div>
<p>There are {this.state.data.length} countries in the api</p>
<div className='countries-wrapper'>{this.renderCountries()}</div>
</div>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
We can use axios with await and async functions. In order to implement await and async we need to have separate function outside the componentDidMount. If we implement await and async the error has to be handled by try and catch.
### react-icons
Icons are integral part of a website. To get different SVG icons
Using npm:
```sh
Asabeneh@DESKTOP-KGC1AKC MINGW64 ~/Desktop/30-days-of-react$ npm install react-icons
```
Using yarn:
```sh
Asabeneh@DESKTOP-KGC1AKC MINGW64 ~/Desktop/30-days-of-react$ yarn add react-icons
```
```js
import React, { Component } from 'react'
import axios from 'axios'
import ReactDOM from 'react-dom'
import moment from 'moment'
import {
TiSocialLinkedinCircular,
TiSocialGithubCircular,
TiSocialTwitterCircular,
} from 'react-icons/ti'
const Footer = () => (
<footer>
<h3>30 Days Of React</h3>
<div>
<TiSocialLinkedinCircular />
<TiSocialGithubCircular />
<TiSocialTwitterCircular />
</div>
<div>
<small> Copyright &copy; {new Date().getFullYear()} </small>
</div>
</footer>
)
class App extends Component {
render() {
return (
<div className='App'>
<h1>Welcome to the world of Icons</h1>
<Footer />
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
### moment
Moment is a small JavaScript library which gives us different time formats.
```sh
npm install moment
```
```js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
class App extends Component {
render() {
return (
<div className='App'>
<h1>How to use moment</h1>
<p>This challenge was started {moment('2020-10-01').fromNow()}</p>
<p>The challenge will be over in {moment('2020-10-30').fromNow()}</p>
<p>Today is {moment(new Date()).format('MMMM DD, YYYY HH:mm')}</p>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
### styled-components
It uses a tagged template literals to style a component. It removes the mapping between components and styles. This means that when you're defining your styles, you're actually creating a normal React component, that has your styles attached to it.
```js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
import styled from 'styled-components'
const Title = styled.h1`
font-size: 70px;
font-weight: 300;
`
const Header = styled.header`
background-color: #61dbfb;
padding: 25;
padding: 10px;
margin: 0;
`
class App extends Component {
render() {
return (
<div className='App'>
<Header>
<div>
<Title>30 Days Of React</Title>
<h2>Getting Started React</h2>
<h3>JavaScript Library</h3>
<p>Instructor: Asabeneh Yetayeh</p>
<small>Oct 15, 2020</small>
</div>
</Header>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
### reactstrap
The [reactstrap](https://reactstrap.github.io/) package allows to use a component with bootstrap.
### lodash
According to the official lodash documentation, 'A modern JavaScript utility library delivering modularity, performance & extras.'
Try to also learn how to use the package _classnames_ and _validator_.
# Exercises
## Exercises: Level 1
1. What is a package?
2. What is a third party package ?
3. Do you have to use third party packages?
4. How do you know the popularity and stability of a third party package?
5. How many JavaScript packages are there on the npm registry?
6. How do you install a third party package?
7. What packages do you use most frequently?
8. What package do you use to fetch data?
9. What is the purpose of classnames package?
10. What is the pupose validator package?
## Exercises: Level 2
1. Learn how to use Sass
2. Learn how to use axios
3. Learn how to use moment and react-icons
4. Use the validator package to validate the form you had in day 12
5. Use classnames to change a class based on some logic.
## Exercises: Level 3
🎉 CONGRATULATIONS ! 🎉
[<< Day 14](../14_Day_Component_Life_Cycles/14_component_life_cycles.md) | [Day 16 >>]()

@ -0,0 +1,23 @@
# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
# dependencies
/node_modules
/.pnp
.pnp.js
# testing
/coverage
# production
/build
# misc
.DS_Store
.env.local
.env.development.local
.env.test.local
.env.production.local
npm-debug.log*
yarn-debug.log*
yarn-error.log*

@ -0,0 +1,5 @@
# 30 Days of React App: Day 15
In the project directory, you can run to start the project
### `npm start`

@ -0,0 +1,34 @@
{
"name": "30-days-of-react",
"version": "0.1.0",
"private": true,
"dependencies": {
"@testing-library/jest-dom": "^4.2.4",
"@testing-library/react": "^9.3.2",
"@testing-library/user-event": "^7.1.2",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-scripts": "3.4.3"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
}
}

@ -0,0 +1,111 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
href="https://fonts.googleapis.com/css?family=Montserrat:300,400,500|Roboto:300,400,500&display=swap"
rel="stylesheet"
/>
<meta
name="description"
content="Web site created using create-react-app"
/>
<title>30 Days Of React App</title>
<style>
/* == General style === */
* {
box-sizing: border-box;
padding: 0;
margin: 0;
}
html,
body {
height: 100%;
line-height: 1.5;
font-family: 'Montserrat';
font-weight: 300;
color: black;
}
.root {
min-height: 100%;
position: relative;
}
.header-wrapper,
.main-wrapper,
.footer-wrapper {
width: 85%;
margin: auto;
}
.header-wrapper,
.main-wrapper {
padding: 10px;
margin: 2px auto;
}
h1 {
font-size: 70px;
font-weight: 300;
}
h2,
h3 {
font-weight: 300;
}
header {
background-color: #61dbfb;
padding: 25;
padding: 10px;
}
main {
padding: 10px;
padding-bottom: 60px;
/* Height of the footer */
}
ul {
margin-left: 15px;
}
ul li {
list-style: none;
}
footer {
position: absolute;
bottom: 0;
width: 100%;
height: 60px;
/* Height of the footer */
background: #6cf;
}
.footer-wrapper {
font-weight: 400;
text-align: center;
line-height: 60px;
}
.user-card {
margin-top: 10px;
}
.user-card > img {
border-radius: 50%;
width: 14%;
}
</style>
</head>
<body>
<div id="root"></div>
</body>
</html>

@ -0,0 +1,13 @@
export const tenHighestPopulation = [
{ country: 'World', population: 7693165599 },
{ country: 'China', population: 1377422166 },
{ country: 'India', population: 1295210000 },
{ country: 'United States of America', population: 323947000 },
{ country: 'Indonesia', population: 258705000 },
{ country: 'Brazil', population: 206135893 },
{ country: 'Pakistan', population: 194125062 },
{ country: 'Nigeria', population: 186988000 },
{ country: 'Bangladesh', population: 161006790 },
{ country: 'Russian Federation', population: 146599183 },
{ country: 'Japan', population: 126960000 },
]

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@ -0,0 +1,137 @@
import React, { Component } from 'react'
import axios from 'axios'
import ReactDOM from 'react-dom'
import moment from 'moment'
import styled from 'styled-components'
import {
TiSocialLinkedinCircular,
TiSocialGithubCircular,
TiSocialTwitterCircular,
} from 'react-icons/ti'
const Title = styled.h1`
font-size: 70px;
font-weight: 300;
`
const SubTitle = styled.h2`
font-weight: 300;
`
const Header = styled.header`
background-color: #61dbfb;
padding: 25;
padding: 10px;
margin: 0;
`
class App extends Component {
constructor(props) {
super(props)
console.log('I am the constructor and I will be the first to run.')
this.state = {
firstName: 'John',
data: [],
day: 1,
congratulate: '',
}
}
componentDidMount() {
const API_URL = 'https://restcountries.eu/rest/v2/all'
axios
.get(API_URL)
.then((response) => {
this.setState({
data: response.data,
})
})
.catch((error) => {
console.log(error)
})
}
static getDerivedStateFromProps(props, state) {
return { firstName: props.firstName }
}
shouldComponentUpdate(nextProps, nextState) {
console.log(nextProps, nextState)
console.log(nextState.day)
if (nextState.day > 31) {
return false
} else {
return true
}
}
doChallenge = () => {
this.setState({
day: this.state.day + 1,
})
}
renderCountries = () => {
return this.state.data.map((country) => {
const languageOrLanguages =
country.languages.length > 1 ? 'Langauges' : 'Language'
const formatLanguages = country.languages
.map(({ name }) => name)
.join(', ')
return (
<div>
<div>
{' '}
<img src={country.flag} alt={country.name} />{' '}
</div>
<div>
<h1>{country.name}</h1>
<p>Capital: {country.capital}</p>
<p>
{languageOrLanguages}: {formatLanguages}
</p>
<p>Population: {country.population}</p>
</div>
</div>
)
})
}
componentDidUpdate(prevProps, prevState) {
if (prevState.day == 30) {
this.setState({
congratulate: 'Congratulations,Challenge has been completed',
})
}
console.log(prevState, prevProps)
}
render() {
return (
<div className='App'>
<Header>
<Title>30 Days Of React</Title>
<h2>Getting Started React</h2>
<h3>JavaScript Library</h3>
<p>Instructor: Asabeneh Yetayey</p>
<small>Oct 15, 2020</small>
</Header>
<p>This challenge was started {moment('2020-10-01').fromNow()}</p>
<p>The challenge will be over in {moment('2020-10-30').fromNow()}</p>
<p>Today is {moment(new Date()).format('MMMM DD, YYYY HH:mm')}</p>
<h1>React Component Life Cycle</h1>
<h1>Calling API</h1>
<TiSocialLinkedinCircular />
<TiSocialGithubCircular />
<TiSocialTwitterCircular />
<button onClick={this.doChallenge}>Do Challenge</button>
<p>Challenge: Day {this.state.day}</p>
{this.state.congratulate && <h2>{this.state.congratulate}</h2>}
<div>
<p>There are {this.state.data.length} countries in the api</p>
<div className='countries-wrapper'>{this.renderCountries()}</div>
</div>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)

@ -0,0 +1,212 @@
<div align="center">
<h1> 30 Days Of React: Higher Order Component</h1>
<a class="header-badge" target="_blank" href="https://www.linkedin.com/in/asabeneh/">
<img src="https://img.shields.io/badge/style--5eba00.svg?label=LinkedIn&logo=linkedin&style=social">
</a>
<a class="header-badge" target="_blank" href="https://twitter.com/Asabeneh">
<img alt="Twitter Follow" src="https://img.shields.io/twitter/follow/asabeneh?style=social">
</a>
<sub>Author:
<a href="https://www.linkedin.com/in/asabeneh/" target="_blank">Asabeneh Yetayeh</a><br>
<small> October, 2020</small>
</sub>
</div>
[<< Day 15](../15_Third_Party_Packages/15_third_party_packages.md) | [Day 17 >>](../17_React_Router/17_react_router.md)
![30 Days of React banner](../images/30_days_of_react_banner_day_16.jpg)
- [Higher Order Component](#higher-order-component)
- [Exercises](#exercises)
- [Exercises: Level 1](#exercises-level-1)
- [Exercises: Level 2](#exercises-level-2)
- [Exercises: Level 3](#exercises-level-3)
# Higher Order Component
The term higher order component is similar to higher order function in JavaScript. In JavaScript, a higher order function is a function that takes another function as a parameter or return another function.
Similar to higher order function, a higher order component takes a component and return another component.
This definition will make sense with examples. Look at the example below for better understand.
```js
// One way of writing a Higher Order Component(HOC)
import React from 'react'
const higherOrderComponent = (Component) => {
return (props) => {
return <Component {...props} />
}
}
```
Most of the time third party libraries use higher order component. For instance redux, react-router-dom and material-u use higher order component.
```js
import React from 'react'
const Button = ({ onClick, text, style }) => {
return (
<button onClick={onClick} style={style}>
{text}
</button>
)
}
const buttonWithStyle = (CompParam) => {
const buttonStyles = {
backgroundColor: '#61dbfb',
padding: '10px 25px',
border: 'none',
borderRadius: 5,
margin: 3,
cursor: 'pointer',
fontSize: 18,
color: 'white',
}
return (props) => {
return <CompParam {...props} style={buttonStyles} />
}
}
const NewButton = buttonWithSuperPower(Button)
class App extends Component {
render() {
return (
<div className='App'>
<Button text='No Style' />
<NewButton text='Styled Button' />
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
Let's make the buttonWithStyle higher order take more parameter in addition to the component.
```js
import React from 'react'
const Button = ({ onClick, text, style }) => {
return (
<button onClick={onClick} style={style}>
{text}
</button>
)
}
const buttonWithStyles = (CompParam, name = 'default') => {
const colors = [
{
name: 'default',
backgroundColor: '#e7e7e7',
color: '#000000',
},
{
name: 'react',
backgroundColor: '#61dbfb',
color: '#ffffff',
},
{
name: 'success',
backgroundColor: '#4CAF50',
color: '#ffffff',
},
{
name: 'info',
backgroundColor: '#2196F3',
color: '#ffffff',
},
{
name: 'warning',
backgroundColor: '#ff9800',
color: '#ffffff',
},
{
name: 'danger',
backgroundColor: '#f44336',
color: '#ffffff',
},
]
const { backgroundColor, color } = colors.find((c) => c.name === name)
const buttonStyles = {
backgroundColor,
padding: '10px 45px',
border: 'none',
borderRadius: 3,
margin: 3,
cursor: 'pointer',
fontSize: '1.25rem',
color,
}
return (props) => {
return <CompParam {...props} style={buttonStyles} />
}
}
const NewButton = buttonWithSuperPower(Button)
const ReactButton = buttonWithSuperPower(Button, 'react')
const InfoButton = buttonWithSuperPower(Button, 'info')
const SuccessButton = buttonWithSuperPower(Button, 'success')
const WarningButton = buttonWithSuperPower(Button, 'warning')
const DangerButton = buttonWithSuperPower(Button, 'danger')
class App extends Component {
render() {
return (
<div className='App'>
<Button text='No Style' onClick={() => alert('I am not styled yet')} />
<NewButton
text='Styled Button'
onClick={() => alert('I am the default style')}
/>
<ReactButton text='React' onClick={() => alert('I have react color')} />
<InfoButton
text='Info'
onClick={() => alert('I am styled with info color')}
/>
<SuccessButton text='Success' onClick={() => alert('I am successful')} />
<WarningButton
text='Warning'
onClick={() => alert('I warn you many times')}
/>
<DangerButton
text='Danger'
onClick={() => alert('Oh no, you can not restore it')}
/>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
The is above example is one use case of Higher Order Component. However, its use case is is more than just styling simple button. It has enormous use cases, it allow us to reuse component and enhance a component with style and functionality. In the coming sections, we will cover React Router and we will use HOC and you will not be surprised when you see one component wrap another component.
# Exercises
## Exercises: Level 1
1. What is higher order function
2. What is Higher Order Component
3. What is the difference between higher order function and higher order component?
4. A higher order component can allow us to enhance a component. (T or F)
## Exercises: Level 2
1. Make a higher order component which can handle all the input type.
## Exercises: Level 3
coming
🎉 CONGRATULATIONS ! 🎉
[<< Day 15](../15_Third_Party_Packages/15_third_party_packages.md) | [Day 17 >>](../17_React_Router/17_react_router.md)

@ -0,0 +1,23 @@
# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
# dependencies
/node_modules
/.pnp
.pnp.js
# testing
/coverage
# production
/build
# misc
.DS_Store
.env.local
.env.development.local
.env.test.local
.env.production.local
npm-debug.log*
yarn-debug.log*
yarn-error.log*

@ -0,0 +1,5 @@
# 30 Days of React App: Day 16
In the project directory, you can run to start the project
### `npm start`

@ -0,0 +1,34 @@
{
"name": "30-days-of-react",
"version": "0.1.0",
"private": true,
"dependencies": {
"@testing-library/jest-dom": "^4.2.4",
"@testing-library/react": "^9.3.2",
"@testing-library/user-event": "^7.1.2",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-scripts": "3.4.3"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
}
}

@ -0,0 +1,111 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
href="https://fonts.googleapis.com/css?family=Montserrat:300,400,500|Roboto:300,400,500&display=swap"
rel="stylesheet"
/>
<meta
name="description"
content="Web site created using create-react-app"
/>
<title>30 Days Of React App</title>
<style>
/* == General style === */
* {
box-sizing: border-box;
padding: 0;
margin: 0;
}
html,
body {
height: 100%;
line-height: 1.5;
font-family: 'Montserrat';
font-weight: 300;
color: black;
}
.root {
min-height: 100%;
position: relative;
}
.header-wrapper,
.main-wrapper,
.footer-wrapper {
width: 85%;
margin: auto;
}
.header-wrapper,
.main-wrapper {
padding: 10px;
margin: 2px auto;
}
h1 {
font-size: 70px;
font-weight: 300;
}
h2,
h3 {
font-weight: 300;
}
header {
background-color: #61dbfb;
padding: 25;
padding: 10px;
}
main {
padding: 10px;
padding-bottom: 60px;
/* Height of the footer */
}
ul {
margin-left: 15px;
}
ul li {
list-style: none;
}
footer {
position: absolute;
bottom: 0;
width: 100%;
height: 60px;
/* Height of the footer */
background: #6cf;
}
.footer-wrapper {
font-weight: 400;
text-align: center;
line-height: 60px;
}
.user-card {
margin-top: 10px;
}
.user-card > img {
border-radius: 50%;
width: 14%;
}
</style>
</head>
<body>
<div id="root"></div>
</body>
</html>

@ -0,0 +1,13 @@
export const tenHighestPopulation = [
{ country: 'World', population: 7693165599 },
{ country: 'China', population: 1377422166 },
{ country: 'India', population: 1295210000 },
{ country: 'United States of America', population: 323947000 },
{ country: 'Indonesia', population: 258705000 },
{ country: 'Brazil', population: 206135893 },
{ country: 'Pakistan', population: 194125062 },
{ country: 'Nigeria', population: 186988000 },
{ country: 'Bangladesh', population: 161006790 },
{ country: 'Russian Federation', population: 146599183 },
{ country: 'Japan', population: 126960000 },
]

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import React, { Component } from 'react'
import ReactDOM from 'react-dom'
const Button = ({ onClick, text, style }) => {
return (
<button onClick={onClick} style={style}>
{text}
</button>
)
}
const buttonWithStyles = (CompParam, name = 'default') => {
const colors = [
{
name: 'default',
backgroundColor: '#e7e7e7',
color: '#000000',
},
{
name: 'react',
backgroundColor: '#61dbfb',
color: '#ffffff',
},
{
name: 'success',
backgroundColor: '#4CAF50',
color: '#ffffff',
},
{
name: 'info',
backgroundColor: '#2196F3',
color: '#ffffff',
},
{
name: 'warning',
backgroundColor: '#ff9800',
color: '#ffffff',
},
{
name: 'danger',
backgroundColor: '#f44336',
color: '#ffffff',
},
]
const { backgroundColor, color } = colors.find((c) => c.name === name)
const buttonStyles = {
backgroundColor,
padding: '10px 45px',
border: 'none',
borderRadius: 3,
margin: 3,
cursor: 'pointer',
fontSize: '1.25rem',
color,
}
return (props) => {
return <CompParam {...props} style={buttonStyles} />
}
}
const NewButton = buttonWithStyles(Button)
const ReactButton = buttonWithStyles(Button, 'react')
const InfoButton = buttonWithStyles(Button, 'info')
const WarningButton = buttonWithStyles(Button, 'warning')
const DangerButton = buttonWithStyles(Button, 'danger')
const SuccessButton = buttonWithStyles(Button, 'success')
class App extends Component {
render() {
return (
<div className='App'>
<h1>Higher Order Components</h1>
<Button text='No Style' onClick={() => alert('I am not styled yet')} />
<NewButton
text='Styled Button'
onClick={() => alert('I am the default style')}
/>
<ReactButton text='React' onClick={() => alert('I have react color')} />
<InfoButton
text='Info'
onClick={() => alert('I am styled with info color')}
/>
<SuccessButton text='Success' onClick={() => alert('I am successful')} />
<WarningButton
text='Warning'
onClick={() => alert('I warn you many times')}
/>
<DangerButton
text='Danger'
onClick={() => alert('Oh no, you can not restore it')}
/>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)

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@ -0,0 +1,23 @@
# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
# dependencies
/node_modules
/.pnp
.pnp.js
# testing
/coverage
# production
/build
# misc
.DS_Store
.env.local
.env.development.local
.env.test.local
.env.production.local
npm-debug.log*
yarn-debug.log*
yarn-error.log*

@ -0,0 +1,5 @@
# 30 Days of React App: Day 17
In the project directory, you can run to start the project
### `npm start`

@ -0,0 +1,34 @@
{
"name": "30-days-of-react",
"version": "0.1.0",
"private": true,
"dependencies": {
"@testing-library/jest-dom": "^4.2.4",
"@testing-library/react": "^9.3.2",
"@testing-library/user-event": "^7.1.2",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-scripts": "3.4.3"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
}
}

@ -0,0 +1,111 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
href="https://fonts.googleapis.com/css?family=Montserrat:300,400,500|Roboto:300,400,500&display=swap"
rel="stylesheet"
/>
<meta
name="description"
content="Web site created using create-react-app"
/>
<title>30 Days Of React App</title>
<style>
/* == General style === */
* {
box-sizing: border-box;
padding: 0;
margin: 0;
}
html,
body {
height: 100%;
line-height: 1.5;
font-family: 'Montserrat';
font-weight: 300;
color: black;
}
.root {
min-height: 100%;
position: relative;
}
.header-wrapper,
.main-wrapper,
.footer-wrapper {
width: 85%;
margin: auto;
}
.header-wrapper,
.main-wrapper {
padding: 10px;
margin: 2px auto;
}
h1 {
font-size: 70px;
font-weight: 300;
}
h2,
h3 {
font-weight: 300;
}
header {
background-color: #61dbfb;
padding: 25;
padding: 10px;
}
main {
padding: 10px;
padding-bottom: 60px;
/* Height of the footer */
}
ul {
margin-left: 15px;
}
ul li {
list-style: none;
}
footer {
position: absolute;
bottom: 0;
width: 100%;
height: 60px;
/* Height of the footer */
background: #6cf;
}
.footer-wrapper {
font-weight: 400;
text-align: center;
line-height: 60px;
}
.user-card {
margin-top: 10px;
}
.user-card > img {
border-radius: 50%;
width: 14%;
}
</style>
</head>
<body>
<div id="root"></div>
</body>
</html>

@ -0,0 +1,13 @@
export const tenHighestPopulation = [
{ country: 'World', population: 7693165599 },
{ country: 'China', population: 1377422166 },
{ country: 'India', population: 1295210000 },
{ country: 'United States of America', population: 323947000 },
{ country: 'Indonesia', population: 258705000 },
{ country: 'Brazil', population: 206135893 },
{ country: 'Pakistan', population: 194125062 },
{ country: 'Nigeria', population: 186988000 },
{ country: 'Bangladesh', population: 161006790 },
{ country: 'Russian Federation', population: 146599183 },
{ country: 'Japan', population: 126960000 },
]

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import React, { Component } from 'react'
import ReactDOM from 'react-dom'
import {
BrowserRouter as Router,
Route,
Switch,
NavLink,
Redirect,
Prompt,
} from 'react-router-dom'
// Home component
const Home = (props) => <h1>Welcome Home</h1>
// About component
const About = (props) => <h1>About Us</h1>
// Contact component
const Contact = (props) => <h1>Contact us</h1>
// Challenge component
const challenges = [
{
name: '30 Days Of Python',
description:
'30 Days of Python challenge is a step by step guide to learn Python in 30 days.',
status: 'completed',
days: 30,
level: 'Beginners to Advanced',
duration: '20 Nov 2019 - 20 Dec 2019',
slug: 'pyhton',
url:
'https://github.com/https://https://github.com/Asabeneh/30-Days-Of-Python.com/Asabeneh/30-Days-Of-JavaScript/30-Days-Of-React',
author: {
firstName: 'Asabeneh',
lastName: 'Yetayeh',
},
},
{
name: '30 Days Of JavaScript',
description:
'30 Days of JavaScript challenge is a step by step guide to learn JavaScript in 30 days.',
status: 'completed',
days: 30,
level: 'Beginners to Advanced',
duration: '1 Jan 2020 - 30 Jan 2020',
slug: 'javascript',
url: 'https://github.com/Asabeneh/30-Days-Of-JavaScript',
author: {
firstName: 'Asabeneh',
lastName: 'Yetayeh',
},
},
{
name: '30 Days Of React',
description:
'30 Days of React challenge is a step by step guide to learn React in 30 days.',
status: 'ongoing',
days: 30,
level: 'Beginners to Advanced',
duration: '1 Oct 2020- 30 Oct 2020',
slug: 'react',
url: 'https://github.com/Asabeneh/30-Days-Of-React',
author: {
firstName: 'Asabeneh',
lastName: 'Yetayeh',
},
},
{
name: '30 HTML and CSS',
description:
'30 Days of HTML and CSS challenge is a step by step guide to learn HTML and CSS in 30 days.',
status: 'coming',
days: 30,
level: 'Beginners to Advanced',
duration: '',
slug: 'html-and-css',
url: '',
author: {
firstName: 'Asabeneh',
lastName: 'Yetayeh',
},
},
{
name: '30 ReactNative',
description:
'30 Days of ReactNative challenge is a step by step guide to learn ReactNative in 30 days.',
status: 'coming',
days: 30,
level: 'Beginners to Advanced',
duration: '',
slug: 'reactnative',
url: '',
author: {
firstName: 'Asabeneh',
lastName: 'Yetayeh',
},
},
{
name: '30 Data Analysis',
description:
'30 Days of Data Analysis challenge is a step by step guide to learn about data, data visualization and data analysis in 30 days.',
status: 'coming',
days: 30,
level: 'Beginners to Advanced',
duration: '',
slug: 'data-analysis',
url: '',
author: {
firstName: 'Asabeneh',
lastName: 'Yetayeh',
},
},
{
name: '30 Machine Learning',
description:
'30 Days of Machine learning challenge is a step by step guide to learn data cleaning, machine learning models and predictions in 30 days.',
status: 'coming',
days: 30,
level: 'Beginners to Advanced',
duration: '',
slug: 'machine-learning',
url: '',
author: {
firstName: 'Asabeneh',
lastName: 'Yetayeh',
},
},
]
const Challenge = ({
challenge: {
name,
description,
status,
days,
level,
duration,
author: { firstName, lastName },
},
}) => (
<div>
<h1>{name}</h1>
<p>{level}</p>
<p>
Author: {firstName} {lastName}
</p>
{duration && (
<>
{' '}
<small>{duration}</small> <br />
</>
)}
<small>Number of days: {days}</small>
<p>{description}</p>
</div>
)
const Challenges = (props) => {
const path = props.location.pathname
const slug = path.split('/').slice(path.split('/').length - 1)[0]
const challenge = challenges.find((challenge) => challenge.slug === slug)
return (
<div>
<h1>30 Days Of React Challenge</h1>
<ul>
{challenges.map(({ name, slug }) => (
<li key={slug}>
<NavLink to={`/challenges/${slug}`}>{name}</NavLink>
</li>
))}
</ul>
<Switch>
<Route
exact
path={'/challenges'}
component={() => <h1>Choose any of the challenges</h1>}
/>
<Route
path={path}
component={(props) => <Challenge challenge={challenge} />}
/>
</Switch>
</div>
)
}
const NotFound = (props) => <h1>The page your looking for not found</h1>
const Navbar = ({ username }) => (
<ul>
<li>
<NavLink to='/'>Home</NavLink>
</li>
<li>
<NavLink to='/about'>About</NavLink>
</li>
<li>
<NavLink to='/contact'>Contact</NavLink>
</li>
<li>
<NavLink to={`/user/${username}`}>User</NavLink>
</li>
<li>
<NavLink to='/challenges'>Challenges</NavLink>
</li>
</ul>
)
const User = ({ match, isLoggedIn, handleLogin }) => {
const username = match.params.username
return (
<div>
{isLoggedIn ? (
<>
<h1>Welcome {username} to the challenge</h1>
<small>Now, you can navigate through all the challenges</small> <br />
</>
) : (
<p>Please login in to access the challenges </p>
)}
<button onClick={handleLogin}>{isLoggedIn ? 'Logout' : 'Login'}</button>
</div>
)
}
const Welcome = ({ handleLogin, isLoggedIn }) => {
return (
<div>
{isLoggedIn ? 'Welcome to the challenge' : <p>Please login in </p>}
<button onClick={handleLogin}>{isLoggedIn ? 'Logout' : 'Login'}</button>
</div>
)
}
class App extends Component {
state = {
isLoggedIn: false,
firstName: 'Asabeneh',
}
handleLogin = () => {
this.setState({
isLoggedIn: !this.state.isLoggedIn,
})
}
render() {
return (
<Router>
<div className='App'>
<Navbar username={this.state.firstName} />
<Prompt
message={({ pathname }) => {
return this.state.isLoggedIn &&
pathname.includes('/user/Asabeneh')
? 'Are you sure you want to logout?'
: true
}}
/>
<Switch>
<Route path='/about' component={About} />
<Route path='/contact' component={Contact} />
<Route
path='/user/:username'
component={(props) => (
<User
{...props}
isLoggedIn={this.state.isLoggedIn}
handleLogin={this.handleLogin}
/>
)}
/>
<Route
path='/login'
component={(props) => (
<Welcome
{...props}
isLoggedIn={this.state.isLoggedIn}
handleLogin={this.handleLogin}
/>
)}
/>
<Route
path='/challenges'
component={(props) => {
return this.state.isLoggedIn ? (
<Challenges {...props} />
) : (
<Redirect to='/user/asabeneh' />
)
}}
/>
<Route exact path='/' component={Home} />
<Route component={NotFound} />
</Switch>
</div>
</Router>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)

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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
# dependencies
/node_modules
/.pnp
.pnp.js
# testing
/coverage
# production
/build
# misc
.DS_Store
.env.local
.env.development.local
.env.test.local
.env.production.local
npm-debug.log*
yarn-debug.log*
yarn-error.log*

@ -0,0 +1,5 @@
# 30 Days of React App: Day 19
In the project directory, you can run to start the project
### `npm start`

@ -0,0 +1,34 @@
{
"name": "30-days-of-react",
"version": "0.1.0",
"private": true,
"dependencies": {
"@testing-library/jest-dom": "^4.2.4",
"@testing-library/react": "^9.3.2",
"@testing-library/user-event": "^7.1.2",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-scripts": "3.4.3"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
}
}

@ -0,0 +1,111 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
href="https://fonts.googleapis.com/css?family=Montserrat:300,400,500|Roboto:300,400,500&display=swap"
rel="stylesheet"
/>
<meta
name="description"
content="Web site created using create-react-app"
/>
<title>30 Days Of React App</title>
<style>
/* == General style === */
* {
box-sizing: border-box;
padding: 0;
margin: 0;
}
html,
body {
height: 100%;
line-height: 1.5;
font-family: 'Montserrat';
font-weight: 300;
color: black;
}
.root {
min-height: 100%;
position: relative;
}
.header-wrapper,
.main-wrapper,
.footer-wrapper {
width: 85%;
margin: auto;
}
.header-wrapper,
.main-wrapper {
padding: 10px;
margin: 2px auto;
}
h1 {
font-size: 70px;
font-weight: 300;
}
h2,
h3 {
font-weight: 300;
}
header {
background-color: #61dbfb;
padding: 25;
padding: 10px;
}
main {
padding: 10px;
padding-bottom: 60px;
/* Height of the footer */
}
ul {
margin-left: 15px;
}
ul li {
list-style: none;
}
footer {
position: absolute;
bottom: 0;
width: 100%;
height: 60px;
/* Height of the footer */
background: #6cf;
}
.footer-wrapper {
font-weight: 400;
text-align: center;
line-height: 60px;
}
.user-card {
margin-top: 10px;
}
.user-card > img {
border-radius: 50%;
width: 14%;
}
</style>
</head>
<body>
<div id="root"></div>
</body>
</html>

@ -0,0 +1,13 @@
export const tenHighestPopulation = [
{ country: 'World', population: 7693165599 },
{ country: 'China', population: 1377422166 },
{ country: 'India', population: 1295210000 },
{ country: 'United States of America', population: 323947000 },
{ country: 'Indonesia', population: 258705000 },
{ country: 'Brazil', population: 206135893 },
{ country: 'Pakistan', population: 194125062 },
{ country: 'Nigeria', population: 186988000 },
{ country: 'Bangladesh', population: 161006790 },
{ country: 'Russian Federation', population: 146599183 },
{ country: 'Japan', population: 126960000 },
]

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import React, { Component } from 'react'
import ReactDOM from 'react-dom'
import axios from 'axios'
const Country = ({
country: { name, capital, flag, languages, population, currency },
}) => {
const formatedCapital =
capital.length > 0 ? (
<>
<span>Capital: </span>
{capital}
</>
) : (
''
)
const formatLanguage = languages.length > 1 ? `Languages` : `Language`
console.log(languages)
return (
<div className='country'>
<div className='country_flag'>
<img src={flag} alt={name} />
</div>
<h3 className='country_name'>{name.toUpperCase()}</h3>
<div class='country_text'>
<p>{formatedCapital}</p>
<p>
<span>{formatLanguage}: </span>
{languages.map((language) => language.name).join(', ')}
</p>
<p>
<span>Population: </span>
{population.toLocaleString()}
</p>
<p>
<span>Currency: </span>
{currency}
</p>
</div>
</div>
)
}
class App extends Component {
state = {
data: [],
}
componentDidMount() {
this.fetchCountryData()
}
fetchCountryData = async () => {
const url = 'https://restcountries.eu/rest/v2/all'
try {
const response = await axios.get(url)
const data = await response.data
this.setState({
data,
})
} catch (error) {
console.log(error)
}
}
render() {
return (
<div className='App'>
<h1>React Component Life Cycle</h1>
<h1>Calling API</h1>
<div>
<p>There are {this.state.data.length} countries in the api</p>
<div className='countries-wrapper'>
{this.state.data.map((country) => (
<Country country={country} />
))}
</div>
</div>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)

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<div align="center">
<h1> 30 Days Of React: Fetch and Axios</h1>
<a class="header-badge" target="_blank" href="https://www.linkedin.com/in/asabeneh/">
<img src="https://img.shields.io/badge/style--5eba00.svg?label=LinkedIn&logo=linkedin&style=social">
</a>
<a class="header-badge" target="_blank" href="https://twitter.com/Asabeneh">
<img alt="Twitter Follow" src="https://img.shields.io/twitter/follow/asabeneh?style=social">
</a>
<sub>Author:
<a href="https://www.linkedin.com/in/asabeneh/" target="_blank">Asabeneh Yetayeh</a><br>
<small> October, 2020</small>
</sub>
</div>
[<< Day 17](../17_React_Router/17_react_router.md) | [Day 19>>]()
![30 Days of React banner](../images/30_days_of_react_banner_day_18.jpg)
- [Fetch and Axios](#fetch-and-axios)
- [Fetch](#fetch)
- [Axios](#axios)
- [Exercises](#exercises)
- [Exercises: Level 1](#exercises-level-1)
- [Exercises: Level 1](#exercises-level-1-1)
# Fetch and Axios
## Fetch
Currently, JavaScript provides a fetch API to make HTTP requests. Fetch might not be supported by all browsers therefore we have install addition package for browser supports. However, if we use Axios we do not need to use additional package for browser support. Axios code seems neater than fetch. In this section we will see the difference between fetch and axios. May be if you want to know the browser support of fetch you check out on [caniuse](https://caniuse.com/ciu/index) website. As of today, it has 95.62% browser support.
```js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
const Country = ({
country: { name, capital, flag, languages, population, currency },
}) => {
const formatedCapital =
capital.length > 0 ? (
<>
<span>Capital: </span>
{capital}
</>
) : (
''
)
const formatLanguage = languages.length > 1 ? `Languages` : `Language`
console.log(languages)
return (
<div className='country'>
<div className='country_flag'>
<img src={flag} alt={name} />
</div>
<h3 className='country_name'>{name.toUpperCase()}</h3>
<div class='country_text'>
<p>{formatedCapital}</p>
<p>
<span>{formatLanguage}: </span>
{languages.map((language) => language.name).join(', ')}
</p>
<p>
<span>Population: </span>
{population.toLocaleString()}
</p>
<p>
<span>Currency: </span>
{currency}
</p>
</div>
</div>
)
}
class App extends Component {
state = {
data: [],
}
componentDidMount() {
const url = 'https://restcountries.eu/rest/v2/all'
fetch(url)
.then((response) => {
return response.json()
})
.then((data) => {
console.log(data)
this.setState({
data,
})
})
.catch((error) => {
console.log(error)
})
}
render() {
return (
<div className='App'>
<h1>React Component Life Cycle</h1>
<h1>Calling API</h1>
<div>
<p>There are {this.state.data.length} countries in the api</p>
<div className='countries-wrapper'>
{this.state.data.map((country) => (
<Country country={country} />
))}
</div>
</div>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
We can implement async and await and make the above code short and clean.
```js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
const Country = ({
country: { name, capital, flag, languages, population, currency },
}) => {
const formatedCapital =
capital.length > 0 ? (
<>
<span>Capital: </span>
{capital}
</>
) : (
''
)
const formatLanguage = languages.length > 1 ? `Languages` : `Language`
console.log(languages)
return (
<div className='country'>
<div className='country_flag'>
<img src={flag} alt={name} />
</div>
<h3 className='country_name'>{name.toUpperCase()}</h3>
<div class='country_text'>
<p>{formatedCapital}</p>
<p>
<span>{formatLanguage}: </span>
{languages.map((language) => language.name).join(', ')}
</p>
<p>
<span>Population: </span>
{population.toLocaleString()}
</p>
<p>
<span>Currency: </span>
{currency}
</p>
</div>
</div>
)
}
class App extends Component {
state = {
data: [],
}
componentDidMount() {
this.fetchCountryData()
}
fetchCountryData = async () => {
const url = 'https://restcountries.eu/rest/v2/all'
const response = await fetch(url)
const data = await response.json()
this.setState({
data,
})
}
render() {
return (
<div className='App'>
<h1>Fetching API using Fetch</h1>
<h1>Calling API</h1>
<div>
<p>There are {this.state.data.length} countries in the api</p>
<div className='countries-wrapper'>
{this.state.data.map((country) => (
<Country country={country} />
))}
</div>
</div>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
If we use async and await we handle the error using try and catch. Let's apply a try catch block in the above code.
```js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
const Country = ({
country: { name, capital, flag, languages, population, currency },
}) => {
const formatedCapital =
capital.length > 0 ? (
<>
<span>Capital: </span>
{capital}
</>
) : (
''
)
const formatLanguage = languages.length > 1 ? `Languages` : `Language`
console.log(languages)
return (
<div className='country'>
<div className='country_flag'>
<img src={flag} alt={name} />
</div>
<h3 className='country_name'>{name.toUpperCase()}</h3>
<div class='country_text'>
<p>{formatedCapital}</p>
<p>
<span>{formatLanguage}: </span>
{languages.map((language) => language.name).join(', ')}
</p>
<p>
<span>Population: </span>
{population.toLocaleString()}
</p>
<p>
<span>Currency: </span>
{currency}
</p>
</div>
</div>
)
}
class App extends Component {
state = {
data: [],
}
componentDidMount() {
this.fetchCountryData()
}
fetchCountryData = async () => {
const url = 'https://restcountries.eu/rest/v2/all'
try {
const response = await fetch(url)
const data = await response.json()
this.setState({
data,
})
} catch (error) {
console.log(error)
}
}
render() {
return (
<div className='App'>
<h1>Fetching API using Fetch</h1>
<h1>Calling API</h1>
<div>
<p>There are {this.state.data.length} countries in the api</p>
<div className='countries-wrapper'>
{this.state.data.map((country) => (
<Country country={country} />
))}
</div>
</div>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
Now, let's see how to do the same API call using axios.
How can do fetch if we have multiple API two call ?
## Axios
Axios is a third party package and we need to install it using npm. It is the most popular way to make HTTP requests(GET, POST, PUT, PATCH, DELETE). In this example, we will cover only a get request.
```js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
import axios from 'axios'
const Country = ({
country: { name, capital, flag, languages, population, currency },
}) => {
const formatedCapital =
capital.length > 0 ? (
<>
<span>Capital: </span>
{capital}
</>
) : (
''
)
const formatLanguage = languages.length > 1 ? `Languages` : `Language`
console.log(languages)
return (
<div className='country'>
<div className='country_flag'>
<img src={flag} alt={name} />
</div>
<h3 className='country_name'>{name.toUpperCase()}</h3>
<div class='country_text'>
<p>{formatedCapital}</p>
<p>
<span>{formatLanguage}: </span>
{languages.map((language) => language.name).join(', ')}
</p>
<p>
<span>Population: </span>
{population.toLocaleString()}
</p>
<p>
<span>Currency: </span>
{currency}
</p>
</div>
</div>
)
}
class App extends Component {
state = {
data: [],
}
componentDidMount() {
const url = 'https://restcountries.eu/rest/v2/all'
axios
.get(url)
.then((response) => {
this.setState({
data: response.data,
})
})
.catch((error) => {
console.log(error)
})
}
render() {
return (
<div className='App'>
<h1>React Component Life Cycle</h1>
<h1>Calling API</h1>
<div>
<p>There are {this.state.data.length} countries in the api</p>
<div className='countries-wrapper'>
{this.state.data.map((country) => (
<Country country={country} />
))}
</div>
</div>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
Let's also implement the axios fetching using async and await.
```js
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
import axios from 'axios'
const Country = ({
country: { name, capital, flag, languages, population, currency },
}) => {
const formatedCapital =
capital.length > 0 ? (
<>
<span>Capital: </span>
{capital}
</>
) : (
''
)
const formatLanguage = languages.length > 1 ? `Languages` : `Language`
console.log(languages)
return (
<div className='country'>
<div className='country_flag'>
<img src={flag} alt={name} />
</div>
<h3 className='country_name'>{name.toUpperCase()}</h3>
<div class='country_text'>
<p>{formatedCapital}</p>
<p>
<span>{formatLanguage}: </span>
{languages.map((language) => language.name).join(', ')}
</p>
<p>
<span>Population: </span>
{population.toLocaleString()}
</p>
<p>
<span>Currency: </span>
{currency}
</p>
</div>
</div>
)
}
class App extends Component {
state = {
data: [],
}
componentDidMount() {
this.fetchCountryData()
}
fetchCountryData = async () => {
const url = 'https://restcountries.eu/rest/v2/all'
try {
const response = await axios.get(url)
const data = await response.data
this.setState({
data,
})
} catch (error) {
console.log(error)
}
}
render() {
return (
<div className='App'>
<h1>React Component Life Cycle</h1>
<h1>Calling API</h1>
<div>
<p>There are {this.state.data.length} countries in the api</p>
<div className='countries-wrapper'>
{this.state.data.map((country) => (
<Country country={country} />
))}
</div>
</div>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)
```
As you have seen, there is no much difference between fetch and axios. But I recommend you to use more axios than fetch because of browser support and easy of use.
# Exercises
## Exercises: Level 1
1. What is HTTP request?
2. What are the most common HTTP requests?
3. What is fetch?
4. What is axios?
5. What is the difference between fetch and axios?
6. Do you prefer fetch to axios for make HTTP requests?
## Exercises: Level 1
1. Find the average metric weight and life span of cats in the following [API](https://api.thecatapi.com/v1/breeds). There are 67 breeds of cats in API.
🎉 CONGRATULATIONS ! 🎉
[<< Day 17](../17_React_Router/17_react_router.md) | [Day 19>>]()

@ -0,0 +1,35 @@
<div align="center">
<h1> 30 Days Of React: Projects</h1>
<a class="header-badge" target="_blank" href="https://www.linkedin.com/in/asabeneh/">
<img src="https://img.shields.io/badge/style--5eba00.svg?label=LinkedIn&logo=linkedin&style=social">
</a>
<a class="header-badge" target="_blank" href="https://twitter.com/Asabeneh">
<img alt="Twitter Follow" src="https://img.shields.io/twitter/follow/asabeneh?style=social">
</a>
<sub>Author:
<a href="https://www.linkedin.com/in/asabeneh/" target="_blank">Asabeneh Yetayeh</a><br>
<small> October, 2020</small>
</sub>
</div>
[<< Day 18](../18_Fetch_And_Axios/18_fetch_axios.md) | [Day 20>>]()
![30 Days of React banner](../images/30_days_of_react_banner_day_19.jpg)
- [Projects](#projects)
- [Exercises](#exercises)
- [Exercises: Level 1](#exercises-level-1)
# Projects
Congratulations for making it to this far. Now, you have a solid understanding of React. I believe we have covered most important features of React and your are ready to work on projects. What we have covered so far is the old version of React. Starting from Day 20, we will learn React Hooks. In the next three days you will work on projects only.
# Exercises
## Exercises: Level 1
🎉 CONGRATULATIONS ! 🎉
[<< Day 18](../18_Fetch_And_Axios/18_fetch_axios.md) | [Day 20>>]()

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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
# dependencies
/node_modules
/.pnp
.pnp.js
# testing
/coverage
# production
/build
# misc
.DS_Store
.env.local
.env.development.local
.env.test.local
.env.production.local
npm-debug.log*
yarn-debug.log*
yarn-error.log*

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# 30 Days of React App: Day 17
In the project directory, you can run to start the project
### `npm start`

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{
"name": "30-days-of-react",
"version": "0.1.0",
"private": true,
"dependencies": {
"@testing-library/jest-dom": "^4.2.4",
"@testing-library/react": "^9.3.2",
"@testing-library/user-event": "^7.1.2",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-scripts": "3.4.3"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
}
}

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
href="https://fonts.googleapis.com/css?family=Montserrat:300,400,500|Roboto:300,400,500&display=swap"
rel="stylesheet"
/>
<meta
name="description"
content="Web site created using create-react-app"
/>
<title>30 Days Of React App</title>
<style>
/* == General style === */
* {
box-sizing: border-box;
padding: 0;
margin: 0;
}
html,
body {
height: 100%;
line-height: 1.5;
font-family: 'Montserrat';
font-weight: 300;
color: black;
}
.root {
min-height: 100%;
position: relative;
}
.header-wrapper,
.main-wrapper,
.footer-wrapper {
width: 85%;
margin: auto;
}
.header-wrapper,
.main-wrapper {
padding: 10px;
margin: 2px auto;
}
h1 {
font-size: 70px;
font-weight: 300;
}
h2,
h3 {
font-weight: 300;
}
header {
background-color: #61dbfb;
padding: 25;
padding: 10px;
}
main {
padding: 10px;
padding-bottom: 60px;
/* Height of the footer */
}
ul {
margin-left: 15px;
}
ul li {
list-style: none;
}
footer {
position: absolute;
bottom: 0;
width: 100%;
height: 60px;
/* Height of the footer */
background: #6cf;
}
.footer-wrapper {
font-weight: 400;
text-align: center;
line-height: 60px;
}
.user-card {
margin-top: 10px;
}
.user-card > img {
border-radius: 50%;
width: 14%;
}
</style>
</head>
<body>
<div id="root"></div>
</body>
</html>

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export const tenHighestPopulation = [
{ country: 'World', population: 7693165599 },
{ country: 'China', population: 1377422166 },
{ country: 'India', population: 1295210000 },
{ country: 'United States of America', population: 323947000 },
{ country: 'Indonesia', population: 258705000 },
{ country: 'Brazil', population: 206135893 },
{ country: 'Pakistan', population: 194125062 },
{ country: 'Nigeria', population: 186988000 },
{ country: 'Bangladesh', population: 161006790 },
{ country: 'Russian Federation', population: 146599183 },
{ country: 'Japan', population: 126960000 },
]

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import React, { Component } from 'react'
import ReactDOM from 'react-dom'
import axios from 'axios'
const Country = ({
country: { name, capital, flag, languages, population, currency },
}) => {
const formatedCapital =
capital.length > 0 ? (
<>
<span>Capital: </span>
{capital}
</>
) : (
''
)
const formatLanguage = languages.length > 1 ? `Languages` : `Language`
console.log(languages)
return (
<div className='country'>
<div className='country_flag'>
<img src={flag} alt={name} />
</div>
<h3 className='country_name'>{name.toUpperCase()}</h3>
<div class='country_text'>
<p>{formatedCapital}</p>
<p>
<span>{formatLanguage}: </span>
{languages.map((language) => language.name).join(', ')}
</p>
<p>
<span>Population: </span>
{population.toLocaleString()}
</p>
<p>
<span>Currency: </span>
{currency}
</p>
</div>
</div>
)
}
class App extends Component {
state = {
data: [],
}
componentDidMount() {
this.fetchCountryData()
}
fetchCountryData = async () => {
const url = 'https://restcountries.eu/rest/v2/all'
try {
const response = await axios.get(url)
const data = await response.data
this.setState({
data,
})
} catch (error) {
console.log(error)
}
}
render() {
return (
<div className='App'>
<h1>React Component Life Cycle</h1>
<h1>Calling API</h1>
<div>
<p>There are {this.state.data.length} countries in the api</p>
<div className='countries-wrapper'>
{this.state.data.map((country) => (
<Country country={country} />
))}
</div>
</div>
</div>
)
}
}
const rootElement = document.getElementById('root')
ReactDOM.render(<App />, rootElement)

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@ -37,7 +37,14 @@
|12|[Forms](./12_Day_Forms/12_forms.md)| |12|[Forms](./12_Day_Forms/12_forms.md)|
|13|[Controlled and Uncontrolled Component](./13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input.md)| |13|[Controlled and Uncontrolled Component](./13_Day_Controlled_Versus_Uncontrolled_Input/13_uncontrolled_input.md)|
|14|[Component Life Cycles](./14_Day_Component_Life_Cycles/14_component_life_cycles.md)| |14|[Component Life Cycles](./14_Day_Component_Life_Cycles/14_component_life_cycles.md)|
|15|[Styles in React😞]()| |15|[Third Party Packages](./15_Third_Party_Packages/15_third_party_packages.md)|
|16|[Higher Order Components](./16_Higher_Order_Component/16_higher_order_component.md)|
|17|[React Router](./17_React_Router/17_react_router.md)|
|18|[Fetch versus Axios](./18_Fetch_And_Axios/18_fetch_axios.md)|
|19|[Projects](./19_projects/19_projects.md)|
|20|[Projects]()|
|21|[Hooks]()|
🧡🧡🧡 HAPPY CODING 🧡🧡🧡 🧡🧡🧡 HAPPY CODING 🧡🧡🧡

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