Well, mutating like that is not very common, except for maybe with alists. In which situations are you mutating the list like that? Usually you would build a reverse list using a recursive function and an accumulator, which can be done without set! (which has a boxing overhead).
-- Linus Björnstam On Sat, 20 Mar 2021, at 15:24, Jean Abou Samra wrote: > Hello, > > I find myself frequently using the following macro: > > (define-macro (prepend! thing lst) > `(set! ,lst (cons ,thing ,lst))) > > Have I missed a module somewhere that does this kind of things? > At least, I couldn't find anything in SRFIs. It may also be the > case that this is too specific to certain non-functional usages > (LilyPond in my case). > > Thanks in advance, > Jean Abou Samra > > >
