#Coding4Humans Book Review – Programming Pearls

I enjoy reading books about computer programming. (At this point you’re probably saying to yourself, “Of course you do, Tom. You big old nerd, you.”)

But the books I prefer to read aren’t about a particular programming language or operating system but the books about the art, history and philosophy of computer programming. Programming Pearls by Jon Bentley is a classic in this particular genre.

Bentley was a computer researcher at the original Bell Labs in Murray Hills, NJ and he used to write a column on various aspects of programming design and problem-solving for the periodical “Communications of the ACM”. This book is made up of selected essays from that column.

This book has earned a permanent spot on my bookshelf in three ways. First, it’s a fascinating glimpse into the history of computing. The year it was published (1986) was the beginning of the personal computer revolution. We were taking the power back from the mainframe computer priesthood. Having a PC was to be like Prometheus with a piece of stolen fire. We had some of the power for ourselves and were struggling to figure out what to do with it. (Hackers: Heroes of the Computer Revolution by Stephen Levy is an excellent look at the people and personalities that built this era.)

This book is also about problem-solving. As Bentley says in the introduction:

The essays in this book are about a more glamorous aspect of the profession: programming pearls whose origins lie beyond engineering, in the realm of insight and creativity.

These days we’re accustomed to being able to just throw more hardware at computing problems. Bentley reminds us that there is still value in thinking a problem through and presents some interesting ideas, examples and exercises to aid in that work.

Finally, there is my favorite essay, “The Back of the Envelope”. If I had my way, this would be required reading for all of my math students.

Let me explain.

I encourage the use of calculators and computers in my math classes to do the computational heavy-lifting. My logic is that if you understand the problem well enough to explain it to a machine, then the actual computation is just a mechanical exercise. But this doesn’t mean that you should just trust outright whatever a machine tells you. You need to know what the answer should look like by using estimation so you can judge the machine’s output. Bentley devotes an entire section to estimation and these skills also extend into other essays, such as “Perspectives on Performance” and “Algorithm Design Techniques”.

Programming Pearls includes exercises at the end of each essay to help you develop your mental muscles (don’t worry, there are hints in the back of the book) and an appendix with a catalog of algorithms. At 256 pages, it’s a pretty breezy read and the organization of topics makes it easy to just dip in wherever you like and start reading. It’s not just an excellent reference but Bentley’s writing style is friendly and intelligent without being condescending. If you’re a programmer (whether hobbyist, student or professional) you need a copy of this book.


Bentley, J. L. (1986). Programming pearls. Reading, MA: Addison-Wesley.

Levy, S. (1984). Hackers: Heroes of the computer revolution. Garden City, NY: Anchor Press/Doubleday.



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