Pavel Fatin

The famous Ninety-Nine Prolog problems (by Werner Hett) transcended their original purpose and became a popular set of exercises for languages other than Prolog.

Solving these puzzles (and comparing your solutions with solutions of others) is a good way to “get a feel” for programing language and to explore idiomatic approaches to particular kind of problems.

Today we can easily find solutions to the problems in almost any wide-spread programming language. However most of the attempts use a single programing language and provide only one solution to each problem.

By providing multiple types of solutions we can enrich our programming “toolbox” and learn pros and cons of various methods. By using several programming languages simultaneously we can easily correlate different programming paradigms and explore limits of language expressive power.

Here goes my take on Ninety-Nine Problems in:

• Scala,
• Java,
• Clojure,
• Haskell.

All the code is available as a GitHub repository.
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Project Euler is a collection of interesting computational problems intended to be solved with computer programs. Most of the problems challenge your skills in algorithm design rather than your knowledge of mathematics.

Thanks to short concrete problems and number-only solutions you don’t have to thinker with IDEs, GUI designers, programming libraries and frameworks, so Project Euler is an excellent tool for learning a new programming language or improving your core programming skills.
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