# ReactJS
* [https://reactjs.org/docs/](https://reactjs.org/docs/)
* [https://github.com/facebook/react/](https://github.com/facebook/react/)
* [https://github.com/facebook/react](https://github.com/facebook/react)
* [http://facebook.github.io/react-native/docs/](http://facebook.github.io/react-native/docs/)
* [https://github.com/reactjs/redux](https://github.com/reactjs/redux)
* [https://github.com/reactjs/react-redux](https://github.com/reactjs/react-redux)
* [https://github.com/facebook/react/tree/master/packages/react-dom](https://github.com/facebook/react/tree/master/packages/react-dom)
* [https://github.com/ReactTraining/react-router](https://github.com/ReactTraining/react-router)
##### Boilerplates
* [https://github.com/mikechabot/react-boilerplate](https://github.com/mikechabot/react-boilerplate)
* [https://github.com/kriasoft/react-starter-kit](https://github.com/kriasoft/react-starter-kit)
* [https://github.com/react-boilerplate/react-boilerplate](https://github.com/react-boilerplate/react-boilerplate)
```
#### notes ####
///
///
//
```
---
* source - [https://github.com/simoneas02/react-cheatsheet](https://github.com/simoneas02/react-cheatsheet)
## 🌈 React Cheat Sheet
> A simple cheat sheet for facilitate the process in the workshops and event about React. Let me know if you see any problem, I'll love a pull request for improve this document.
---
## Installation
* Add the tags in your HTML
```
<script src="https://unpkg.com/react@16/umd/react.development.js" crossorigin></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js" crossorigin></script>
```
* Run this scripts in your terminal
```
$ npm install react react-dom
```
---
## No configuration
Just start with React no configuration (run the scripts bellow in your terminal)
* Install the React
```
$ npm install -g create-react-app
```
* Create your application (change `myApp` to your application name)
```
$ create-react-app myApp
```
* Go to the application folder and install the dependencies
```
$ cd myApp
$ npm install
```
* Start your application
```
$ npm start
```
* Go to the browser by `URL` bellow and see your beautiful application
- [localhost:8080](http://localhost:8080)
---
## ReactDOM
```js
import React, { Component } from 'react';
import ReactDOM from 'react-dom';
ReactDOM.render( <h1>Hello React Ladies</h1>, document.getElementById('root') );
```
---
## Functional Stateless Component
```js
import React from 'react';
const Button = () =>
<button> Apply</button>
export default Button;
```
```js
import React from 'react';
const Button = ({ onClick, className = 'button', children }) =>
<button
onClick={ onClick }
className={ className }
type='button'
>
{ children }
</button>
export default Button;
```
---
## Class Component
```js
import React, { Component } from 'react';
class MyComponent extends Component {
render() {
return (
<div className="main">
<h1>Helo Devas</h1>
</div>
);
}
}
export default MyComponent;
```
```js
import React, { Component } from 'react';
class MyComponent () extends Compnent {
constructor ( props ) {
super(props);
this.state = { message: 'Helo Devas' }
};
render() {
return (
<div className="main">
<h1>{ this.state.message }</h1>
</div>
);
}
}
export default MyComponent;
```
---
## Composition
```js
import React, { Component } from 'react';
import ReactDOM from 'react-dom';
class Love extends Component {
render() {
return (
<div clssName="love">
<h1>My love</h1>
</div>
);
}
}
class LoveList extends Component {
render() {
return (
<div>
<Love />
<Love />
<Love />
<Love />
</>
);
}
}
ReactDOM.render(
<Love />,
document.getElementById(´root´)
);
```
## Module component
```js
//App.js
import React, { Component } from 'react';
class App extends Component {
render() {
return (
<div className="app">
<p>My App</p>
</div>
);
}
}
export default App
```
```js
//Index.js
import React, { Component } from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
class Index extends Component {
render() {
return (
<div className="app">
<App />
</div>
);
}
}
ReactDOM.render (
<Index />,
document.getElementById('root')
);
```
---
## Hot Module Replacement
* Retain application state which is lost during a full reload.
* Save valuable development time by only updating what's changed.
* Tweak styling faster -- almost comparable to changing styles in the browser's debugger.
```js
import React, { Component } from 'react';
import ReactDOM from 'react-dom';
import MyComponent from './MyComponent';
ReactDOM.render( <MyComponent />, document.getElementById('root') );
if (module.hot) {
module.hot.accept();
}
```
---
## Props
```js
import React, { Component } from 'react';
class App extends Component {
render() {
return (
<div className="app">
<p>My App {this.props.name}</p>
</div>
);
}
}
class Index extends Component {
render() {
return (
<div className="app">
<App name="Simone"/>
</div>
);
}
}
export default Index;
```
---
## State
```js
import React, { Component } from 'react';
class App extends Component {
constructor(props) {
super(props);
this.state = {messages: 0};
}
render() {
return (
<div className="app">
<p>My messages: {this.state.messages}</p>
</div>
);
}
}
export default App;
```
---
## Methods and Events
```js
import React, { Component } from 'react';
class App extends Component {
escreve() {
console.log("Eu te amo");
}
render() {
return (
<div className="app">
<button onClick={this.escreve}>save</button>
</div>
);
}
}
export default App;
```
---
## State manipulation
```js
import React, { Component } from 'react';
class App extends Component {
constructor() {
super();
this.state = { like: 0 };
}
isLiked = () => {
this.setState({ like: this.state.like + 1});
}
render() {
return (
<div className="app">
<button onClick={ this.isLiked }>{ this.state.like }</button>
</div>
);
}
}
export default App;
```
```js
import React, { Component } from 'react';
class App extends Component {
constructor() {
super();
this.state = { messages: ['JS', 'React'] };
}
addMessages = () => {
const updateMessages = [...this.state.messages, 'Polymer']
this.setState({ messages: [...updateMessages] })
}
render() {
return (
<div className="app">
<button onClick={this.addMessages}>add</button>
{console.log(this.state.messages) /* ['JS', 'React', 'Polymer'] */}
</div>
);
}
}
export default App;
```
---
d
## Bindings
```js
import React, { Component } from 'react';
class MyComponent extends Component {
constructor () {
super();
this.state = { list: list };
this.doSomethingElse = this.doSomethingElse.bind(this);
};
doSomething = () => {
// do something
/* if don't have a parameter, you can use arrow function
and don't need to use bind */
}
doSomethingElse ( itemId ) {
// do something else
}
render() {
return (
<div className="main">
{this.state.list.map( item =>
...
<button
onClick={ this.doSomething }
type="button"
>
Some Thing
</button>
<button
onClick={ () => this.doSomethingElse( item.objectID ) }
type="button"
>
Some Thing Else
</button>
...
)}
</div>
);
}
}
export default MyComponent;
```
---
# ES6
## Arrow Functions
### Syntax
#### Basic syntax
```js
( param1, param2, ..., paramN ) => { statements }
( param1, param2, ..., paramN ) => expression
( singleParam ) => { statements }
singleParam => { statements }
() => { statements }
```
#### Advanced Syntax
```js
params => ({ foo: bar }) /* return an object literal expression */
( param1, param2, ...ladies ) => { statements } /* rest parameters */
( language = JS, ladies, ..., framework = React ) => { statements } /* default parameters */
const sum = ( [num1, num2] = [1, 2], { x: num3 } = { x : num1 + num2 } ) => num1 + num2 + num3 /* destructuring within the parameter list */
sum() /* 6 */
```
---
## Spread Operations
### Spread in array literals
```js
const basics = [ 'JS', 'HTML', 'CSS' ];
const frameworks = [ 'React', 'Vue' ];
const web = [ ...basics, ...frameworks ];
console.log(web); /* ['JS', 'HTML', 'CSS', 'React', 'Vue'] */
const addWeb = [ ...web, 'al11' ];
console.log(addWeb); /* ['JS', 'HTML', 'CSS', 'React', 'Vue', 'al11'] */
```
### Spread in object literals
```js
const basics = { behavior: 'JS', markup: 'HTML' };
const style = 'CSS';
const web = { ...basics, style };
console.log(web); /* { behavior: "JS", markup: "HTML", style: "CSS" } */
const devFront = { framework: 'react', event: 'React Conf' };
const devBack = { framework: 'django', state: 'cool' };
const cloneDev = { ...devFront };
console.log(cloneDev); /* { framework: 'react', event: 'React Conf' } */
const merged = { ...devFront, ...devBack };
console.log(cloneDev); /* { framework: 'django', event: 'React Conf', state: 'cool' } */
```