Escape from Zurg: An Exercise in Logic Programming by Martin Erwig. Journal of Functional Programming, Vol. 14, No. 3, 253-261, 2004
In this article we will illustrate with an example that modern functional programming languages like Haskell can be used effectively for programming search problems, in contrast to the widespread belief that Prolog is much better suited for tasks like these.
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The example that we want to consider is a homework problem that we have given in a graduate level course on programming languages. The problem was one of several exercises to practice programming in Prolog. After observing that many students had problems manipulating term structures in Prolog (after already having learned to use data types in Haskell) and spending a lot of time on debugging, the question arose whether it would be as difficult to develop a solution for this problem in Haskell. This programming exercise worked well, and we report the result in this paper.
(Haskell source code)
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