Grzegorz Ziółkowski

Greg Ziółkowski
Greg Ziółkowski
@gziolo@gziolo.pl

Husband, father, open sourcerer, and basketball fan. Writes code at Automattic and contributes to WordPress core.

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  • Different types of software testing

    Software testing helps protect code from incoming bugs and improves general quality of the functionalities exposed to the users. When you look at it from the developer’s standpoint the first thing that comes to mind is unit testing. However it turns out tests come in many flavors. I have already shared in the recap from Advanced…

  • Picking Jest over Mocha – testing tools comparison

    At Automattic we use Mocha to run all tests written for Calypso project which powers WordPress.com. It also includes end-to-end tests, which live in their own repository. We have been using this setup for over 3 years now. I think it is a good moment to revisit this choice. I found this unit testing tools comparison very…

  • Time to get interactive as a performance measure

    I have already published one post about Progressive Web Apps (PWA) a few months back. It looks like Google is investing a lot of efforts to make it a new standard of building websites. At the last Google I/O, there were a few announcements made related to making PWA a default feature in a few popular…

  • React as a cross-platform UI

    I got very excited when watching this talk for React Europe by Leland Richardson:

  • Dominican Republic

  • Gdynia, Poland

  • Barcelona, Spain

  • Functional Light JavaScript workshop

    Functionite company did an impressive job bringing JavaScript expert Kyle Simpson to their hometown Warsaw, Poland in September last year. He led You Don’t Know JS Workshops, 5 days of JavaScript classes focused on learning new skills and the best practices. I joined on the last day to attend an excellent workshop titled Functional-Light JavaScript. In this post, I wanted to share slides and my…

  • A journey to functional JavaScript: Part 1 – fundamentals

    JavaScript has a quite fascinating history. Brendan Eich created on his own the first language prototype in just ten days. Its implementation was highly influenced by the concepts of first-class functions from Scheme and prototypes from Self. Initially, it was developed under the name Mocha, but released as LiveScript. The latter name didn’t last long either. Java was so hot back in 1995, that Netscape decided to…

  • Sri Lanka

    Sri Lanka is an island country in South Asia near south-east India. It was known from the beginning of British colonial rule until 1972 as Ceylon. It’s still more recognizable in Poland by its old name because of the popularity of Ceylon tea. However this country has much more to offer, it is not limited to the picturesque tea…