Object Creation: Builder vs. Constructor vs. Setter

When we create new objects, we are basically confronted with the need to provide at least one construction pattern. Of course depending on the language we have more or less three ways to go that are commonly available. Traditionally in OO it was mandatory to write setters and getters. In C++ or Java they really […]

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JSON instead of Java Serialization: The solution?

We start recognizing that Serialization is not such a good idea. It is cool and can really work on a wide range of objects, even including complex and cyclic reference graphs. And it was essential for some older Java frameworks like EJB and RMI, which allowed remote access to Java objects and classes. But it […]

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Visit to reClojure in London 2019

On 2019-12-02 I visited the conference reClojure. This was an admirable community effort to create a replacement for ScalaExchange, which simply did not happen because of the bankruptcy of Skillsmatter. There was only one track, so the schedule is exactly what I visited. I will just copy it below, because schedules from conference sites usually […]

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Company „Skillsmatter“ stops operations

The company Skillsmatter in London has been put „under administration“ and basically stopped its operations. The web site seems to suggest, that everything is still ok, but that is not the case and I have heard so from several sources. The owner Wendy Devolder writes on Twitter and on Linkedin. Or here are some more […]

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Clojure Exchange 2018

I visited Clojure Exchange 2018 in London. Since there was only one track and I attended all talks, it is easy to just refer to the schedule. Interesting topics, that came up multiple times in different flavors where immutability, stories of building real life applications, music, java and clojure and the transition, clojure script, emacs […]

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Logging

Deutsch Software often contains a logging functionality. Usually entries one or sometimes multiple lines are appended to a file, written to syslog or to stdout, from where they are redirected into a file. They are telling us something about what the software is doing. Usually we can ignore all of it, but as soon as […]

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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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Clojure-Art

It is an interesting idea to generate colorful images using or music. In both areas Clojure seems to be quite attractive. Not having explored the music side, I did find the idea of creating images fun and inspiring. It also shows us something about the functions we are working with, if we learn to read […]

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DB Persistence without UPDATE and DELETE

When exploring the usage of databases for persistence, the easiest case is a database that does only SELECT. We can cache as much as we like and it is more or less the functional immutable world brought to the database. For working on fixed data and analyzing data this can sometimes be useful. Usually our […]

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