HI, You could look at the Zippers library http://clojure.org/other_libraries which is useful for editing nested structures in a functional way... or perhaps you might use one of the Clojure reference types to hold the notes?
Cheers, James On Dec 22, 8:09 am, PM <peter.mccull...@gmail.com> wrote: > I'm a new Clojure user. I've been working my way through SICP and the > videos that accompany it, and I've also read the Clojure book. I > already do a lot of work with a music notation library (JMSL) in Java, > and I'd like to see if I could do some tasks more simply in Clojure. > > One of the issues I run into is how to represent a musical score using > immutable objects. A naïve representation of a score might look > something like: > > - Score contains measures > - Measures contain staves > - Staves contain tracks > - Tracks contain notes > - Notes contain articulations, dynamics, and other extras. > > I've mocked it up before using structmaps, but I get stuck when it > comes to doing all this with immutable structures. Immutability is no > problem for a system like Lilypond where the score data is fixed when > the program runs, but in a system where some of these items may be > changing as the score is edited, how do you handle that? Returning a > new note via assoc implies that a track's contents would also change, > making it a new track, and so on up the chain. (?) > > I have to be missing something, and probably something glaring. I > understand that I could easily do this with mutable code, but if > anyone could provide some insight into this, it would be greatly > appreciated. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
