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

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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