Abstract Heresies

Most popular computer languages don't have symbols as a data type. You can make do with a string, or encode your symbol as a small i...

I saw this recently: token = request.headers.get('Authorization') token = token.split(' ')[1] From an imperative pr...

The idle puzzles got some web traffic, so here are a couple more in the same vein. Not much new, just a variation on a theme. They can b...

I've been amusing myself with these little puzzles. They're simple enough you can do them in your head, but I coded them up just ...

Here's a few things I've been playing with lately. jrm-code-project/utilities has a few utilities that I commonly use. Include...

fold-left has this basic recursion: (fold-left f init ()) = init (fold-left f init (a . d)) = (fold-left f (f init a) d) A straightfo...

Here's a 2x2 matrix: [64919121 -159018721] [41869520.5 -102558961] We can multiply it by a 2 element vector like this: (defun mxv (a b...