About the AuthorMartin Sikora has been professionally programming since 2006 for companies such as Miton CZ, Symbio Digital, and PRIA in various languages, mostly PHP and TypeScript. Since 2017, hes freelancing, trying to work on open source projects in TypeScript, PHP, Dart, C, and Python. Hes been actively contributing to RxPHP and RxJS 5 on both Github and StackOverflow. He is a Zend certified engineer and was a member of the winning team during Google Dart Hackathon 2012 in Prague. His first publication was Dart Essentials, by Packt, published in May 2015. Occasionally, Martin writes articles for https://www.smashingmagazine.com/. You can connect with him on LinkedIn at https://cz.linkedin.com/in/martin-sikora-a63b9a30 or GitHub at https://github.com/martinsik.