mjackson

import React from 'react'

const MyComponent = React.createClass({
  componentDidMount() {
    // To go from React to non-React code, use the lifecycle hooks. In
    // this example, we use componentDidMount to call some external function
    // once our component is mounted. We pass the DOM node as convenience in
    // case the external code needs to do something with it.
    this.props.onSomething(this.node)
  },

yarl

<?php

$zoom = htmlspecialchars($_GET["zoom"]);
$x = htmlspecialchars($_GET["x"]);
$y = htmlspecialchars($_GET["y"]);

//explanation: https://gist.github.com/tmcw/4954720
$y = pow(2, $zoom)-$y-1;

//source: https://github.com/timwaters/whoots/blob/master/whoots.rb