I am a lifelong object-oriented programmer. My job is primarily java development, but I have experience in a number of languages. Ruby gave me my first real taste of functional programming. I loved the features Ruby borrowed from the functional paradigm such as closures and continuations. Eventually, I graduated to Scala. This has be...
I am passing in command line arguments to my Lisp program and they are formatted like this when they hit my main function: ("1 1 1" "dot" "2 2 2") I have a dot function (which takes two vectors as arguments) and would like to call it directly from the argument, but this isn't possible because something like (funcall (second args)...) r...
I started using Code Collector Pro to organise and save my Emacs codes, and this software requires TextMate bundles for syntax highlighting. They have a lisp bundle, but not an elisp bundle, at least not that I can see. I would think that the syntax highlighting would work under the lisp bundle, but for some reason it isn't happening. I...
How come most Lisps and Schemes are dynamically typed? Does static typing not mix with some of their common features? ...
I want to construct a macro that, given a symbol 'foo, creates a method called foo*. How can I concatenate 'foo and '*? ...
The code below doesn't behave as I would expect. ; given a function name, its args and body, create 2 versions: ; i.e., (double-it foo []) should create 2 functions: foo and foo* (defmacro double-it [fname args & body] `(defn ~fname ~args ~@body) `(defn ~(symbol (str fname "*")) ~args ~@body)) The code abo...
I had never really thought about whether a symbol could be a number in Lisp, so I played around with it today: > '1 1 > (+ '1 '1) 2 > (+ '1 1) 2 > (define a '1) > (+ a 1) 2 The above code is scheme, but it seems to be roughly the same in Common Lisp and Clojure as well. Is there any difference between 1 and quoted 1? ...
Basically I want to spawn a process changing its working directory. My idea was to spawn a process and set the PWD enviroment variable. There's a way to obtain something like that? (virtually I would like to change any of the environment variables for flexibility) ...
How do I see if one CLOS class is a subclass of another CLOS class? ...
I started learning CLISP. Should I improve my self. What can be done with this programming language? What's it for. I'd appreciate your answers and comments. Thanks. ...
Hi, I've been getting my hands wet with emacs lisp, and one thing that trips me up sometimes is the dynamic scope. Is there much of a future for it? Most languages I know use static scoping (or have moved to static scoping, like Python), and probably because I know it better I tend to prefer it. Are there specific applications/instances ...
Python When I learned Python I installed it on windows with a nice gui installer and all .py files would automatically run in python, from the command line or explorer. I found this very intuitive and easy, because I could instantly make plain text files and run them. Lisp I'm starting to learn lisp and have decided (from reviews) th...
I enjoy using recursion whenever I can, it seems like a much more natural way to loop over something then actual loops. I was wondering if there is any limit to recursion in lisp? Like there is in python where it freaks out after like 1000 loops? Could you use it for say, a game loop? Testing it out now, simple counting recursive functi...
This is really just a conceptual question for me at this point. In Lisp, programs are data and data are programs. The REPL does exactly that - reads and then evaluates. So how does one go about getting input from the user in a secure way? Obviously it's possible - I mean viaweb - now Yahoo!Stores is pretty secure, so how is it done? ...
Is there any easy to set up Common Lisp gui libraries? I've been trying to install many but I always come up with errors. The only one I got to fully work is Ltk but I hear there's problems with that, especially on windows. LispBuilder-sdl was the easiest library to install but non of the others will work? I'm really confused about this?...
I'm trying to create a "system" command for clisp that works like this (setq result (system "pwd")) ;;now result is equal to /my/path/here I have something like this: (defun system (cmd) (ext:run-program :output :stream)) But, I am not sure how to transform a stream into a string. I've reviewed the hyperspec and google more than ...
Given a tree, I want to find the paths from the root to each leaf. So, for this tree: D / B / \ A E \ C-F-G has the following paths from root (A) to leaves (D, E, G): (A B D), (A B E), (A C F G) If I represent the tree above as (A (B D E) (C (F G))) then the function g does the trick: (define (paths tree) (cond ...
I've started learning Scheme, for fun mostly, and because I've never used a functional language before. I chose Scheme because I wanted to read SICP for a long time. Anyway, I'm currently learning about lists, and before that I learned about cons, car and cdr. And there's an example that creates a list of lists with cons, like this : ...
I'm currently trying to get proficient in Common Lisp and to learn some of the tricks for writing compact, clear and beautiful code in it. So, I want to know if you have any sources of good Common Lisp, preferably free and online but books are also OK. ...
I have a buffer open in emacs. I want a function that will return t if the current buffer contains the string, otherwise it returns nil. (defun buffer-contains-substring (string) ... ) ...