I have tried putting clojure-contrib.jar various places on my filesystem, I have tried manually specifying the classpath when launching the REPL, I have tried extracting the jar and putting the clj files on the classpath, nothing seems to work. I continue getting something like this: java.io.FileNotFoundException: Could not locate cloju...
I have a byte buffer 6 bytes long first four contains ip address last 2 contains port, in big endian notation. to get the ip i am using, (apply str (interleave (map int (take 4 peer)) (repeat "."))) Is casting bytes to int safe to get the ip address? and also in java i use, int port = 0; port |= peerList[i+4] & 0xFF; po...
For example, the prxml function prints XML to *out*. I would like to instead capture this output as a String. Here is the typical usage from a REPL: user> (prxml [:p "Test"]) <p>Test</p>nil I'd instead like to do: (def xml (capture-out (prxml [:p "Test"]))) I made up the capture-out function, but I suspect something like it exists,...
I have a heavy web dev background with PHP. My reasons for learning a functional programming languages are: to improve my programming skills. It was heavily suggested that learning a FPL helps. this has high priority because I want to be better and better. learn a general purpose programming language to solve tasks like scripting (OS s...
I have this deeply nested list (list of lists) and I want to replace a single arbitrary element in the list. How can I do this ? (The built-in replace might replace many occurrences while I need to replace only one element.) ...
I can perfectly see why Clojure is really good for concurrent programming. I can see the advantages of FP also in this regard. But clearly, not every line of code that we write is part of a thread or needs concurrent access. For those parts of the code (the more simple and sequential piece of code) what is it that Java really missed tha...
I'm trying to convert from HTML to Latex, and want to change this: <a href="www.foo.com/bar">baz</a> into: baz\footnote{www.foo.com/bar} I'd like to generate a Clojure function to take a chunk of text, and replace as many matches as exist in a given paragraph. I've tried (.replaceAll "<a href=\"foo.com\">baz</a>" "<a.*h...
I'd prefer examples to be in a Lisp variant (bonus points for Clojure or Scheme) since that's what I'm most familiar with, but any feedback regarding DBC in functional lanugages would of course be valuable to the greater community. Here's an obvious way: (defn foo [action options] (when-not (#{"go-forward" "go-backward" "turn-right...
Both Junit and TestNG provide mechanisms for iterating over a collection of input parameters and running your tests against them. In Junit this is supported via the Parameterized annotation, while TestNG uses @DataProvider. How can you write data-driven tests using the test-is library? I tried using for list comprehension to iterate ove...
I'd like to be able to do something like this: (search data list? (fn [x] (and (list? x) (= 4 (first x)))) (fn [x] (and (set? x) (contains x 3)))) And have it recursively search a nested data structure data: first for the shallowest lists (might be in a set of sets, for example). then within those lists for the shallowest li...
Hi! Has anyone ever tried to change swing's look and feel? This code, taken from an example, simply yields a null pointer exception, and I wonder what might be wrong: (javax.swing.UIManager/setLookAndFeel (javax.swing.UIManager/getSystemLookAndFeelClassName)) Thanks! ...
Usually, we have situation like this in C++ int a=0; if(some_condition_satisfied(g)) { a = eval(g); // never returns 0 } if(a!=0) { do_something(); } How can I do the above in Clojure without using refs, because I cannot assign after initialization? Thanks. ...
Is there any tutorial/screencast available online for free to figure out how to use/install vimClojure. ...
Hi, I have a Clojure data structure of the form: {:foo '("bar" "blat")} and have tried writing them to a file using the various pr/prn/print. However, each time the structure is written as {:foo ("bar" "blat")} then when I try to read in it using load-file, I get an error such as: java.lang.ClassCastException: java.lan...
If I have something like this: int foo() { if(somecondition) { // some code if(cond2) return -1; // some code again } if(cond3){ // something again } return bar(); } How do I express it in Clojure? it should not be written as if_elseif because both the somecondition and cond3 may be tr...
I am trying to execute a func several times before giving up upon exceptions. But it is not valid in Clojure to recur from catch block. How can this be achieved ? (loop [tries 10] (try (might-throw-exception) (catch Exception e (when (pos? tries) (recur (dec tries)))))) java.lang.UnsupportedOperationException: Cannot r...
NOTE: Already made this a Wiki. I don't care what this question is tagged as, as long as there is a good discussion. I've heard that since in pure functional programs, there are no side effects and values dont mutate, it makes it easier for the compiler to make more runtime optimizations. To what extent is this true? If this is true, m...
How would I get something similar to the following?: (evaluate-text "(+ 1 2)") ; resolves to 3 ...
I am trying to build a directory tree such as how xml trees are represented, in the form of a vector, i can traverse the file system fine using the following snippet but i can't put my head around how to build a tree structure out of this? (defn trav [dir] (if (.isDirectory dir) (do (println (.getName dir)) (doseq [fi...
I need to be able to establish a connection between two boxes that are both behind NAT? I have a central system that both sides can find each other through. I'm working in Clojure. ...