What's a good toString method for a deftype'd object in clojure
Depending on exactly what you're trying to do, the simplest way is to use defrecord: user=> (defrecord Bag [state]) user.Bag user=> (def b (Bag. :foo)) #'user/b user=> b #:user.Bag{:state :foo} Though what you see above is from pr, not str: user=> (str b) "user.Bag@53e935f4" user=> (prn b) #:user.Bag{:state :foo} nil So we just make a change: user=> (defrecord Bag [state] Object (toString [bag] (p
Which tutorial on Clojure is best? - Stack Overflow
I'm interested in learning Clojure. The Getting Started page on Clojure.net is pretty minimal. Is there a good language introduction or tutorial out there? Which would you recommend? Answer: I have watched the videos on youtube called Intro to Clojure. I don't recommend those. They are a little too brief and don't give a lot of background. The talks by Clojure creater Rich Hickey. I am finding the
Common programming mistakes for Clojure developers to avoid
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Calling clojure from java
Update: Since this answer was posted, some of the tools available have changed. After the original answer, there is an update including information on how to build the example with current tools. It isn't quite as simple as compiling to a jar and calling the internal methods. There do seem to be a few tricks to make it all work though. Here's an example of a simple Clojure file that can be compile
A gentle tutorial to Emacs/Swank/Paredit for Clojure
[Edit from non-author: this is from 2010, and the process has been significantly simplified since May 2011. I'll add a post to this answer with my setup notes as of Feb 2012.] You'll need to put together a few pieces: Emacs, SLIME (which works perfectly well with Clojure -- see swank-clojure), swank-clojure (the Clojure implementation of SLIME's server counterpart), clojure-mode, Paredit and, of c
How do I stop jetty server in clojure?
I am writing a web application using ring and clojure. I am using the jetty adapter for the development server and emacs/SLIME for IDE. While wrap-reload does help, run-jetty blocks my slime session and I would like to be able to start/stop it at will without having to run it in a separate terminal session. Ideally, I would like to define a server agent and functions start-server and stop-server t
Dynamically generating high performance functions in clojure
Hamza Yerlikaya has already made the most important point, which is that Clojure code is always compiled. I'm just adding an illustration and some information on some low-hanging fruit for your optimisation efforts. Firstly, the above point about Clojure's code always being compiled includes closures returned by higher-order functions and functions created by calling eval on fn / fn* forms and ind
GUI in Scala/Groovy/Clojure
DISCLAIMER: I'm a Clojure programmer. I'm obviously biased. Of all of those languages, I think Clojure and Groovy are probably the most compact. Scala is a curly-bracket language like Java, so it tends to take up a bit more space. However, it's nowhere near as verbose as Java is, and I think Scala is pretty awesome. I know that Scala has a swing wrapper. I've never done GUI development in Scala, s
Building a Clojure app with a command-line interface?
I just started w/ Clojure (coming from Ruby) and I would like to build an small app with a command-line interface. How do I handle input/output to a CL? I noticed that there is a clojure.contrib.command-line, but documentation is slim. http://github.com/richhickey/clojure-contrib/blob/ffa868411cda6c617105b52b4f6f9e0f37ee8c24/src/clojure/contrib/command_line.clj
Is there a software-engineering methodology for functional programming?
Software Engineering as it is taught today is entirely focused on object-oriented programming and the 'natural' object-oriented view of the world. There is a detailed methodology that describes how to transform a domain model into a class model with several steps and a lot of (UML) artifacts like use-case-diagrams or class-diagrams. Many programmers have internalized this approach and have a good
Please explain some of Paul Graham's points on Lisp
Matt's explanation is perfectly fine -- and he takes a shot at a comparison to C and Java, which I won't do -- but for some reason I really enjoy discussing this very topic once in a while, so -- here's my shot at an answer. On points (3) and (4): Points (3) and (4) on your list seem the most interesting and still relevant now. To understand them, it is useful to have a clear picture of what happe
Escape/sanitize user input in Clojure/Compojure
hiccup.util/escape-html in hiccup does it. That function used to be in Compojure itself (since all of the functionality in hiccup used to be part of Compojure). It's a simple enough function that you could easily write it yourself though. (defn escape-html "Change special characters into HTML character entities." [text] (.. #^String (as-str text) (replace "&" "&") (replace "<" "<") (replace
Clojure open source projects - Stack Overflow
Well, one of the fantastic things about Clojure is that there's already an abundance of great libraries out there -- and new ones are being written and made available all the time. (Note that the majority of the code you're likely to find out there -- minus the blogosphere which is full of all sorts of examples, of course -- is library code.) Here's a collection of links for a good start: Clojure
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