Joel Spolsky just published a great (and very brief) explanation of functional programming. There’s also a podcast of Berkeley’s CS 61A SICP course from Spring ‘06 that I found – the first few lectures on functional programming are really worth your time. And finally, for a rambling, evening-discussion style explanation of functional programming, complete with historical anecdotes, there’s Functional Programming for the Rest of Us. [You might want to save that one, and come back when you have some time…but do come back to it.]

Joel’s article got me thinking. I’m not really working on applications (at work or for fun) that really need massive concurrency, so that benefit of functional programming never swayed me much. Most of the uses I see for functional programming are simple things, like the selector filters I wrote about in Hacking the Browser’s DOM for Fun…given an array, use a function to specify which elements you’re interested in. Just like Ruby’s find and find_all methods, and Java’s FileFilter and FileNameFilter classes. It’s like I’m using a Maserati just to commute. Well, The Little Schemer is on my wishlist…it’ll be fun to try the examples in both Scheme and Ruby. Maybe even JavaScript.

Now, I went to a Java School, so I only heard about functional programming, LISP, Scheme, Ruby, and all these strange beasts once I started teaching myself off the internet. No one at any of my jobs ever mentioned them. How is it that our field can have such a rich heritage, and almost no one knows about it? Ask the person in the next cube over whether they’ve ever heard of functional programming, whether they know what it is, or can explain it to you. I guess 80% of you get blank looks. [This offer void at telcos and good universities.]

Quite a few people call that a competitive advantage. And they’re right – having scarce information puts you ahead of those without that information. But it seems short-sighted to me to gloat over that temporary advantage, when you’re missing the contributions that the people in the dark could be making.

UPDATE: It occurs to me that this might sound like I think functional programming should be used for everything – hardly the case, especially given my lack of experience with it, which I readily admit to. My point is, why don’t more of us know about it? Why isn’t it taught in more universities, or talked about at work?