ReactJS

I am

Joe Karlsson

V

M

C

Thinking in React

JSX

Looks like HTML

const Button = () => {
    return (
	<div className="Button">
          About
	</div>
    );
};

It's
not HTML

Props

Pass values from the parent component to its children

class ParentComponent extends Component {
  render () {
    return (
      <ChildComponent 
        name="John"
      />
    );
  }
};

class ChildComponent extends Component {
  render () {
    return (
      <h1>My name is {this.props.name}!!</h1>
   );
  }
};

State

Reactively updates the component

class Square extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      value: 0,
    };
  }

  render() {
    const { value } = this.state;
    return (
      <button className="square" onClick={() => {
        this.setState({value: ++value})
      }}>
        {this.state.value}
      </button>
    );
  }
}

Lifecycle Methods

Runs after the component has been rendered

ReactJS

By Joe Karlsson

ReactJS

  • 1,014
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