Scala has recently introduced async and await features. It allows to write clean and easy-to-understand code for cases where otherwise complex composition of futures would be needed. The same thing already exists in C# for quite a while. But I always had a feeling that I don’t really know how does it work. I tried… Continue reading Await without waiting
With a little help from our friends
“How many bugs have your unit tests found? And why they didn’t find the one that’s currently killing our production? See? This proves that unit testing doesn’t work. It’s just a waste of money. My money.” said the boss. Of course not my boss. That’s actually a pretty valid point. How to prove that unit… Continue reading With a little help from our friends
Scala Wonderland: Case classes and pattern matching
Pattern matching is usually related to text search. In Scala it has much more sophisticated usage. You can write exciting decision logic when used together with case classes. Even after understanding what the two things mean I wasn’t able to use them as they deserve. It takes a while to really grasp them. Long and… Continue reading Scala Wonderland: Case classes and pattern matching
Seduced by the West
I was born and lived 30 years in Bratislava, capital of Slovakia. After studies I started working for IBM as a C#/Java developer and stayed there for 5 years. Nice years. I have learned a lot, met great people, traveled around the world. Not to forget, I have earned some money. Nice money. IBM has… Continue reading Seduced by the West
Scala Wonderland: Semicolons, singletons and companion objects
In Scala you may usually omit semicolon at the end of a statement. It is required if more statements are on a single line. Unfortunately there are cases when compiler doesn’t undrstand the code as you would expect. For example following is treated as two statements a and +b: a + b Solution is to… Continue reading Scala Wonderland: Semicolons, singletons and companion objects
Scala Wonderland: Lists
In functional style methods should not have side effects. A consequence of this philosophy is that List is immutable in Scala. Construction of a List is simple. val abc = List(“a”, “b”, “c”) There is one trick in the previous code. A common trick in Scala. It invokes method named apply on List companion object.… Continue reading Scala Wonderland: Lists
The Rule of Failed Integration Build
What to do if an integration build fails? By failing I mean either there is a compilation error or an automated test fails. The general rule in most of the teams that I worked with is that this situation should be treated with the highest priority. The developer who has caused this problem is responsible… Continue reading The Rule of Failed Integration Build
Scala Wonderland: The functional style
Scala encourages to use a functional style of programming. For programmers coming from imperative world of Java or C# it is the main challenge. The first step is to recognize the difference between functional and imperative programming. Scala has two keywords for variable declaration: var – mutable variables val – immutable variables One sign of… Continue reading Scala Wonderland: The functional style
Scala Wonderland #1: All operations are method calls
I’ve started learning Scala two months ago and I can’t get back to Murakami’s 1Q84 so exciting it is. In the coming series I’d like to share my excitement with you. It won’t be yet another step-by-step tutorial. I’ll share features that made me think (IBM should be proud of me). For whatever reason. val… Continue reading Scala Wonderland #1: All operations are method calls
Church of Agile
Following a plan. Over and over. We don’t need no education. Shepherd and sheep Sheep: “May I move an user story to another iteration? How long should our Sprint be? What if our daily standup takes more than 15 minutes?” Shepherd: “Don’t worry my dear. Subscribe to these courses and we’ll teach you how. You’ll… Continue reading Church of Agile