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staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

qodot

심볼

심볼이 무엇인가? ES6에서 새로 선보인 원시 타입이다.

• Undefined
• Null
• Boolean
• Number
• String
• Object

hg-pyun

const ThemeContext = React.createContext('light');

class ThemeProvider extends React.Component {
  state = {theme: 'light'};

  render() {
    return (
      <ThemeContext.Provider value={this.state.theme}>
        {this.props.children}
      </ThemeContext.Provider>

hg-pyun

class MyComponent extends React.Component {
  constructor(props) {
    super(props);

    this.inputRef = React.createRef();
  }

  render() {
    return <input type="text" ref={this.inputRef} />;
  }

hg-pyun

class FancyButton extends React.Component {
  buttonRef = React.createRef();

  focus() {
    this.buttonRef.current.focus();
  }

  render() {
    const {label, theme, ...rest} = this.props;
    return (

hg-pyun

function withTheme(Component) {
  return function ThemedComponent(props) {
    return (
      <ThemeContext.Consumer>
        {theme => <Component {...props} theme={theme} />}
      </ThemeContext.Consumer>
    );
  };
}

hg-pyun

function withTheme(Component) {
  function ThemedComponent({forwardedRef, ...rest}) {
    return (
      <ThemeContext.Consumer>
        {theme => (
          // Assign the custom prop "forwardedRef" as a ref
          <Component
            {...rest}
            ref={forwardedRef}
            theme={theme}

hg-pyun

<DataProvider render={data => (
  <h1>Hello {data.target}</h1>
)}/>

hg-pyun

class MouseTracker extends React.Component {
  constructor(props) {
    super(props);
    this.handleMouseMove = this.handleMouseMove.bind(this);
    this.state = { x: 0, y: 0 };
  }

  handleMouseMove(event) {
    this.setState({
      x: event.clientX,