Perl and Scala: what can they learn from each other?

Ironically Scala at first drew my interest, because I discovered that about ten years ago there was no really good understanding of how to do a good multithreading concept for Perl 6. I thought exploring how they do it in Scala, where it was already known to be good at that time, would give a […]

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Exceptions to implement Program Logic

Sometimes it is conveniant to use exceptions for implementing the regular program logic. Assuming we want to find some data and then process them. When no data is found, this step can be skipped, because there is nothing to do. So we could program something like this: public Data readData(Param param) {     Data data = db.read(param);     if (data.isEmpty()) {         throw new NotFoundException(„nothing found“);     }     return data; } public ProcessedData doWork(Param param) { […]

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Scala Days 2019

Scala Days had a tenth anniversary in 2019. It is an annual conference about Scala, which I like to visit, when possible. There is some confusion as to what is meant: Where this the 9th, 10th or 11th Scala Days? Where the first Scala Days 9, 10 or 11 years ago? The truth is, that […]

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Flashsort in Scala

There is now also an implementation of Flashsort in Scala. In order to solve the requirement of sorting part of an array that is needed as part of flashsort, an heapsort implementation in Scala that can be constrained to a part of an array has been included as well. Heapsort was chosen, because it can […]

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Meaningless Whitespace in Textfiles

We use different file formats that are more or less tolerant to certain changes. Most well known is white space in text files. In some programming languages white space (space, newline, carriage return, form feed, tabulator, vertical tab) has no meaning, as long as any whitespace is present. Examples for this are Java, Perl, Lisp […]

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Loops with unknown nesting depth

We often encounter nested loops, like for (i = 0; i < n; i++) { for (j = 0; j < m; j++) { doSomething(i, j); } } This can be nested to a few more levels without too much pain, as long as we observe that the number of iterations for each level need […]

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Scala Days 2018

In 2018 I visited Scala Days in Berlin with this schedule. Other than in previous years I missed the opening keynote, which is traditionally on the evening before the main conference starts, because this is not so well compatible with my choice of traveling with a night train, especially because I did not want to […]

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ScalaUA 2018

About a week ago I visited Scala UA in Kiev. This was the schedule. It was a great conference once again, as it was already in 2017 and I really enjoyed everything, including the food, which was great again… 🙂 I listened to the following talks on the first day: Tales from the trenches, developing […]

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Christmas — Weihnachten — Рождество 2017

Bon nadal! — Priecîgus Ziemassvçtkus — З Рiздвом Христовим — Buon Natale — Bella Festas daz Nadal! — С Рождеством — Срећан Божић — καλά Χριστούγεννα — God Jul! — Feliĉan Kristnaskon — ميلاد مجيد — Feliz Navidad — Glædelig Jul — Fröhliche Weihnachten — Joyeux Noël — Hyvää Joulua! — クリスマスおめでとう ; メリークリスマス — […]

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Scala Exchange 2017

I have visited Scala Exchange („#ScalaX“) in London on 2017-12-14 and 2017-12-15. It was great, better than 2015 in my opinion. In 2016 I missed Scala Exchange in favor of Clojure Exchange. This time there were really many talks about category theory and of course its application to Scala. Spark, Big Data and Slick were […]

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