I am trying to find a Clojure-idiomatic way to "compress" a vector: (shift-nils-left [:a :b :c :a nil :d nil]) ;=> (true [nil nil :a :b :c :a :d]) (shift-nils-left [nil :a]) ;=> (false [nil :a]) (shift-nils-left [:a nil]) ;=> (true [nil :a]) (shift-nils-left [:a :b]) ;=> (false [:a :b]) In other words, I want to move all of the nil va...
I have the following contents in src/main/clojure/za/co/pb/maven_test/test.clj file: (ns za.co.pb.maven-test.test (:gen-class)) (defn -main [] (println "Hello world!")) I also have a POM that has the necesary dependencies on clojure-maven-plugin with the compile execution. If I execute a mvn package command, I get a target/maven...
I must be dense this morning :-). According the the JetBrains La Clojure page, the plugin indentation is customizable. I can't find the customization anywhere. I looked in "File->Settings" everywhere and even did a search for "clojure". Where can I find this? I am running IntelliJ 9.0.3 CE (Build 95.429) with La Clojure 0.2.267 on OS ...
I have a Clojure map that may contain values that are nil and I'm trying to write a function to remove them, without much success (I'm new to this). E.g.: (def record {:a 1 :b 2 :c nil}) (merge (for [[k v] record :when (not (nil? v))] {k v})) This results in a sequence of maps, which isn't what I expected from merge: ({:a 1} {:b 2})...
So I have defined some vars to hold state data in my clojure code. I have just discovered I can add a doc-string to those vars e.g.: (def ^{:doc "Documentation for *my-var*"} *my-var*) That lets me call (doc *my-var*) at the REPL. This seems like a valid and useful thing to do but it doesn't seem like common practice in the (...
Got these examples I would like to understand but they are in Scheme. I would like them in Clojure :D Example 1 - counting the length of a list (define length (lambda (ll) (cond ((null? ll) 0) (#t (add1 (length (cdr ll))))))) Exemple 2 - square each element of a list (define squares (lambda (li) (co...
During the last months I have tried to code using the functional programming paradigm. Now I have a solution in OOP and I am trying to find a functional solution. The problem is simple. I have an algorithm, which produces two different arrays as result (a and b). Now, I want to check how good the results are. Therefore I write several ...
I have a list of lists and would like to get this into a map where the key is one of the common values in the lists (animal name in this example). I know how to use into {} and for to create a map from a list but this is not exactly what I want. I want the key (animal's name) in the map to refer to a list of lists of these values. I've ...
I am looking for a list of the allowed characters in a clojure keyword. Specifically I am interested to know if any of the following characters are allowed. "-" "_" "/". [EDIT] I am not a java programmer. So i would not know the underlying ramifications if any. I dont know if the clojure keyword is mapped to a java keyword if there is s...
Sorry for the noob question, but is there an good way to destructure values from a sequence like this.. (somefunc [[a b c] [1 2 3 4 5 6 7 8 9]] (prn a b c)) ..with the a b c being assigned values until the sequence exhausted and letting me call a function on the args? doseq requires a partition of the right size.. (doseq [[a b c] (pa...
For the next code: (ns clojure101.series) (defn avg [[x y]] (/ (+ x y) 2)) (defn avg-damp [seq] (map avg (partition 2 seq))) (defn avg-damp-n [n] (apply comp (repeat n avg-damp))) (defn sums [seq] (reductions + seq)) (defn Gregory-Leibniz-n [n] (/ (Math/pow -1 n) (inc (* 2 n)))) (def Gregory-Leibniz-pi (map #(...
When all you have is a pair of bolt cutters and a bottle of vodka, everything looks like the lock on the door of Wolf Blitzer's boathouse. (Replace that with a hammer and a nail if you don't read xkcd) I currently program Clojure, Python, Java and PHP, so I am familiar with the C and LISP syntax as well as the whitespace thing. I know i...
What is the good starting point for Clojure development on Google AppEngine? Seems like there are two competing libraries appengine-magic and compojure-gae. What is your opinion? ...
Hy everyone, I've successfully installed clojure-mode, slime, slime-repl within Emacs. I start a swank server with "lein swank" and hang slime to it with "slime-connect". I can use the SLIME REPL to evaluating Clojure expression within the REPL. How can I eval a single s-exp or a whole file (a.k.a I want to run a Clojure file withing Ema...
Perhaps I'm going about this all wrong, but I'm trying to get all the matches in a string for a particular regex pattern. I'm using re-matcher to get a Match object, which I pass to re-find, giving me (full-string-match, grouped-text) pairs. How would I get a sequence of all the matches produced by the Match object? In Clojuresque Pytho...
Short version: I am interested in some Clojure code which will allow me to specify the transformations of x (e.g. permutations, rotations) under which the value of a function f(x) is invariant, so that I can efficiently generate a sequence of x's that satisfy r = f(x). Is there some development in computer algebra for Clojure? For (a tri...
Is there any DSL (Domain Specific Language) implemented in Clojure ? ...
I'm developing some simulation software in Clojure that will need to process lots of vector data (basically originating as offsets into arrays of Java floats, length typically in 10-10000 range). Large numbers of these vectors will need to go through various processing steps - e.g. normalising the vectors, concatenating together two stre...
Hi to everyone, I was wondering about which is the best (clojuresque) way to compare a character and a string in Clojure. Obviously something like that returns false: (= (first "clojure") "c") because first returns a java.lang.Character and "c" is a single character string. Does exists a construct to compare directly char and string w...
Clojure's new contrib library group has a finger tree library. What are the use cases for finger trees in clojure? When should finger trees be used instead of one of clojure's other peristent data strucures: vectors, sets, maps, persistentqueues, etc. The Joy of Clojure mentions that Finger trees can be used for indexed collections wh...