button.js

/*eslint no-console:0*/
import React from '../';

const {
  Board,
  Button,
  Led,
} = React;

const HIGH = 255;
const LOW = 0;

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

    this.state = {value: LOW};
    this.toggle = this.toggle.bind(this);
  }

  toggle() {
    this.setState({value: this.state.value === LOW ? HIGH : LOW});
  }

  render(): ?ReactElement {
    return (
      <Board>
        <Button onPress={this.toggle} onRelease={this.toggle} />
        <Led pin={9} value={this.state.value} />
      </Board>
    );
  }
}

var PORT = '/dev/tty.usbmodem1411';
React.render(<Application value={HIGH} />, PORT);