On Fri, Apr 16, 2010 at 12:41 PM, Aravindh Johendran
<[email protected]> wrote:
> Sorry, I shoulda been clearer. By similar functionality, i meant a 20-
> q game with
> 1) the network implemented as closures and
There are various ways you can do this while separating concerns. If
you don't mind specifying the question nodes in
definition-precedes-use order, here is one (untested) way that closely
follows the structure of Graham's code but does not use mutable state:
(defn prompt [s]
(print s)
(flush)
(read))
(defn add-node [nodes node question yes-node no-node]
(assoc nodes node
#((nodes (if (= 'yes (prompt (format "%s\n>> " question)))
yes-node
no-node)))))
((:people (reduce #(apply add-node %1 %2) {} [[:people "Is the person
a man?" :male :female], ...])))
> State is unavoidable in many circumstances I suppose.
Fewer than you would think. Even then, a good design will cleanly
separate the pure from the impure.
-Per
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