Review: Once Upon an Algorithm: How Stories Explain Computing

Once Upon an Algorithm: How Stories Explain Computing by Martin Erwig
My rating: 2 of 5 stars

A couple of years ago I read a similar book, Christian’s “Algorithms To Live By: The Computer Science of Human Decisions”. It overlapped with this book by about 40% in terms of what was covered – search algorithms being a major common topic. The difference is that Christian’s book was focused on applying algorithms to personal decisions and Erwig’s book was focused on teaching computer science terminology. Both used stories to do this – Christian uses anecdotes, where Erwig uses comparisons to movies and books. I found Christian’s book entertaining and memorable. I didn’t enjoy Erwig’s as much. The examples he used were mostly not uniquely appropriate. For instance, he uses Sherlock Holmes to explain some search algorithms, but this seemed not the best example to me. Then with recursion he uses the movie “Groundhogs Day”. This seems quite obvious. (I will say that I appreciated his listings of different movies/books that had repeating days and the different “rules of science” those replays had – I have noticed that and have written about that as well.) The book starts with an example from Hansel and Gretel of using shiny stones to find their way back home, and drilled down to how Hansel made each individual decision on how to proceed. I was surprised that the author had so few different examples illustrating the computer science and math concepts. I’d say about half of the book was very basic computer science lecture without comparison to a particular story, and half was using one of those three stories to help illustrate a concept. Personally, as someone who has taken many computer science classes, the concepts were not new to me, and the book didn’t seem that helpful for learning new concepts. The terminology was still difficult covered as completely as the author has done here. I expect this book was aimed at the textbook market for the Computer Science version of the “Physics for Poets” classes at university. It would be interesting to test its effectiveness compared to more traditional textbooks.

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