Code is a cost and has a negative value, yes I said it finally. “Most startups die because they build the wrong product. The core risks are rarely technical; if no one wants the product, building it well won’t change the outcome.” - Zach Tellman In 2013, I went to the 2nd edition of DevDay. This was my first conference ever in the different city. It was a blast. The team behind it recently started a new event - DevConf - knowing Rafal and Michal it will be great, check it out. In 2013, I remembered on...

In this talk, I will present techniques for efficient incremental processing of complex analytical queries, ranging from classical SQL queries to linear algebra programs. Our system, called DBToaster, compiles declarative database queries into high-performance stream processing engines that keep query results (views) fresh at very high update rates. DBToaster uses a recursive query compilation algorithm that materializes a supporting set of higher-order delta views to achieve a substantially lower view m...

Co to jest kontener IoC? IoC czyli Inversion of Control lub też odwrócenie zależności, brzmi bardzo ogólnie, ale co się pod tym kryje? Możemy tutaj zaliczyć wzorzec fabryki, service locatora (lub też antywzorzec), czy też dependency injection i na tym ostatnim się skupimy. Wzorzec ten może zostać zaimplementowany np. poprzez: constructor injection, property injection, jednak najbardziej sensowny jest ten pierwszy sposób. Polega on na wstrzyknięciu zależności poprzez konstruktor. Kontener IoC ma nam...

University degree and IT Posted on by Michal Franc University degree importance in IT is a big topic of many discussion around the internet, I also received a question like that. Q: Is University degree really that important for future career in IT sector. Wouldn’t it be better to start working as soon as possible and sacrifice study time for more work experience. I am a student now, and I do feel now that studying is limiting my potential and growth. The things that, I am doing now in my work are co...

From procedural to functional – an example in F# Posted on by Michal Franc In this blog post, I show little code review of a code sent to me by friend. The code is quite simple example on how to read XML file using XmlProvider. My friend’s biggest concern was that his code is still procedural and not ‘functional’. I was asked if this code can be refactored to be more functional, whatever it means. First of all, the code that I got, is fine and most importantly it works. Even when you are using F# to ...

Akka.NET simple example with Github Api Posted on by Michal Franc In this post I want to a simple introduction to Akka.NET using an example app based on Github api. I have been diving into Akka .NET lately. My first encounter with this technology was on Vaughn Vernon workshop in Krakow. The main event had couple of side presentation and one of them was about Akka project in Java world. It was a magic to me. Couple years later, I accidentally found ( probably on twitter ) Bartosz Sypytkowski blog and ...

Docker here docker there docker everywhere – Getting started with docker in .NET with F# Posted on by Michal Franc Docker here docker there docker everywhere – Getting started with docker in .NET and F# If you are in IT world, you surely heard or read about docker. There was / is a huge hype about this technology. It looks like this one might actually survive the initial ‘It’s awesome phase’. I was looking for some info about docker. It was confusing to get to know what docker really is. Too much mar...

In this post, I want to go beyond “Hello World” and show real life examples. F# and Nancy – Where to start ?

Get out of your comfort zone – Vim the social connector Posted on by Michal Franc I am a .Net developer, mostly. Sure, I am exploring Python, node.js and other technologies, still my work is mostly related to C# and recently I am having fun with F#. I can say that as of now I am tied to one platform and I mostly attending meetups and conferences slightly related to it. Recently I have gone to one of the meetups and I had opportunity to chat with awesome PHP programmers. Boy that was fun. MS technol...

Last time I finished on negative values requirement. This will be the “almost” last part of the series about String Calculator Kata. There was some interest in more practical TDD examples in business context with services, layers, mocks and external dependencies like database. I will start next series to cover scenarios like that. Current kata is...