LispForum

See http://github.com/death/dbus/blob/maste ... #L315-L325.

If generality and avoiding accidental complexity is the aim, we can decompose the problem like this: Mapping the structure: (defun map-tree (function tree) (typecase tree (null) (cons (map-tree function (car tree)) (map-tree function (cdr tree))) (t (funcall function tree)))) Counting objects: (defu...

Because if you doing the exact same operation on multiple variables then you almost always was a datastructure. If you're doing the exact same operation on multiple variables/values you want an operator, not a data structure. A data structure might make sense when there is a connection between diff...

Tip: whenever you have (reduce <function1> (mapcar <function2> <list>) ...) you can replace it with (reduce <function1> <list> :key <function2> ...), avoiding intermediate garbage.

I don't know why proposed solutions used an alist/hash-table. I think lispamour got it basically right. My proposed solution: (defun count-bases (tree) (let ((as 0) (ts 0) (gs 0) (cs 0)) (labels ((rec (x) (etypecase x ((eql a) (incf as)) ((eql t) (incf ts)) ((eql g) (incf gs)) ((eql c) (incf cs)) (n...

Maybe someone should try it without any sort of optimizing algorithm. If massive mult-core is in the future, then I'd be interested to see how even a dumb implementation works. How about a Lisp where every variable clause of a let (not let*, obviously) is evaluated on a different core if the assign...

See http://cs-www.cs.yale.edu/homes/dvm/format-stinks.html. The OUT macro is easy to extend.

I guess I should have been more specific about what I wanted to know. I wanted to know about the details of your particular case, i.e. what implementation you chose to use, what libraries you had trouble with, what that trouble was, how far did you go before you decided to use Ruby, why didn't you h...

findinglisp wrote:With Lisp, I was fighting the libraries and sockets and streams and such.

Can you be more specific about these problems, and about how standardization might have helped?

I'll keep all that in mind, it sounds like great advice, but my thinking is that there are certain macros which establish a context in which the body operates; for example, WITH-OPEN-FILE establishes the context of the file in the sense that it opens the file, lets you do whatever you need with tha...