clojure
Reducers missing
I noticed that reduced and reduced?, which were added in clojure 1.5, are missing from the cheatsheet.
Right you are. In fact, there is nothing in there at all about reducers, added in Clojure 1.5, which includes about a dozen other vars in the clojure.core.reducers namespace.
I personally have not yet understood reducers well enough to suggest a categorization of those functions. I would prefer to add most or all of those below with a reasonable categorization and placement in the cheatsheet, rather than only add 2 of them. If you have a suggestion for how to categorize all of them, please do so.
Namespace clojure.core:
reduced reduced?
Namespace clojure.core.reducers:
append! cat coll-fold drop filter fjtask flatten fold foldcat folder map mapcat monoid pool reduce reducer remove take take-while
I actually haven't used clojure.core.reducers. So I won't be able to suggest categorization for them. Let me try to look at them in some detail.
Here are some links I have been saving up about them, but haven't gone through it in detail yet:
Official Clojure documentation on reducers, recently edited by Alex Miller. It includes links to 2 blog posts on reducers:
http://clojure.org/reducers
Video of EuroClojure 2012 talk by Rich Hickey on reducers:
http://vimeo.com/45561411
Additional info: Clojure 1.7.0-alpha1 and -alpha2 have added transducers, and at least one statement from Alex Miller on the #clojure IRC channel suggests that while reducers were added to Clojure as an alpha feature, transducers have no such qualification -- Rich Hickey considers them to be a part of Clojure core.
First public announcement that I am aware of on transducers: http://blog.cognitect.com/blog/2014/8/6/transducers-are-coming That said, I haven't taken the time to understand transducers well enough to suggest a categorization of their new functions, either, but I would wait until Clojure 1.7 is released before considering that seriously.