Comments on: Clojure refactoring: flattening reduces

By: Meikel

Meikel — Fri, 30 Apr 2010 09:55:21 +0000

Same for me: just needed this and luckily remembered this post. You should rename your blog to “Treasure Chest” or so. :)

By: William Hidden

William Hidden — Wed, 07 Apr 2010 14:24:46 +0000

Thanks for writing this idiom up. I had a need for just such an idiom today and instead of a lot of small nested reduces I used the a for form to handle it all.

By: Ivan Koblik

Ivan Koblik — Sat, 27 Feb 2010 20:34:29 +0000

Very neat way to flatten sequence of sequences! I would usually do something like what Nicolas did, but this way is much better. Thank you for posting it!

By: Simplicity on Steroids | BEST IN CLASS

Simplicity on Steroids | BEST IN CLASS — Thu, 04 Feb 2010 20:29:51 +0000

[...] all the examples, you’re seeing the power of the seq-abstraction. Lets say you need to work on a nested strucuture, only working on the innermost data — double bound for is your friend. Imagine you have a [...]

By: Nicolas Buduroi

Nicolas Buduroi — Tue, 19 Jan 2010 23:50:13 +0000

That’s just awesome, really neat code!

I used to write something like this: (clojure.contrib.seq-utils/flatten (apply concat (map seq foo))) instead of (for [x foo, y x, z y] z), I don’t use ‘for’ enough.

By: cgrand

cgrand — Tue, 19 Jan 2010 19:23:10 +0000

@Jeremey: it was a seq of maps of sets (which I could have obtained from a database) and the computation used values of the sets and keys of the maps.

By: Patrick Sullivan

Patrick Sullivan — Tue, 19 Jan 2010 19:17:01 +0000

Took me a sec to figure out what you’re doing but that is freakin’ awesome. Will have to remember it in the future.

By: Jeremey

Jeremey — Tue, 19 Jan 2010 19:07:08 +0000

OK, please keep this sort of thing to yourself. You’re scaring people. :) (see: http://search.twitter.com/search?q=too+stupid+to+program+in+clojure )

I’m kidding, but one of the reasons I love Clojure is that it’s deeply practical for problems that don’t resolve to math functions. Some elaboration might benefit this example. I guess you have a sequence of sequences of sequences and want to reduce f over all values contained therein? (where values are always in the innermost sequences only)

Thanks for the blog!