Hi, I just (mostly) finished reading the Programming Clojure book and while it gave a great overview of the language, I'm still at a loss for how to design programs.
Maybe my mind has been polluted by OO concepts. For example, I'm trying to figure out how to do polymorphism in FP. Specifically, an electrical circuit "is a" type of graph (vertices and nodes). The book specifically says that multimethods are rare, so I'm thinking I probably shouldn't immediately go to multimethods to do what I want to do. What I'm trying to figure out is how to take an abstract concept like a graph G comprising vertices and edges (V, E), and then "derive" from this a specific type of graph, specifically an electrical circuit. I'm also greatly influenced by SICP, but I have yet to "get" how to do anything really, other than play with small ideas. In the electrical circuit, you can have the nets be the edges and the vertices be the pins on a device. In this case there is exactly one edge per vertex, but there can be many vertices per edge. Another way is to have both nets and nodes be vertices in the graph, with edges simple indicating a connection. In an analog circuit there is no directionality; in a digital circuit there is. In any case I want an edge to have a list of its vertices, and a vertex to know its edge. It can be cyclic or acyclic. Anyway, so suppose I find a graph library (I know they exist). How do I abstract the library into something that looks like a circuit, but still be able to use the methods for the library? In OO, suppose the library class has something like "get-edges", but the circuit class which derives from it, this method would be called because the circuit "is a" type of graph. The implementation of get-edges and the internal structure of the graph class should be hidden from the user. So how do I do this? thanks Michael -- 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
