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We're excited to have you attend one of our workshops! Here's a JavaScript (re)fresher to help you get up-to-speed on some features of the language we'll be using.

Let and Const

JavaScript has always had var:

var name = 'Ryan'

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// @flow
// Turn a callback-based listener into many async iterators without buffering
import { $$asyncIterator } from 'iterall';

type Listener = ((arg: any) => void) => Promise<any>;

const defaultOnError = (err: Error) => {
  throw new Error(err);
};

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// Benötigt PhantomJS. Benutzung: $ phantomjs grab.js

var page = require('webpage').create();
page.viewportSize = {
  width: 10000,  // A0: 9933
  height: 15000  // A0: 14043
};

page.open('http://localhost/~peter/map/map.html', function(){
  setTimeout(function(){

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import React, { PropTypes } from 'react';
import styled from 'styled-components'

const Wrapper = styled.div`
  // styles here that used to be for .test
`

const Label = styled.label`
  // label styles here
`