On 18.01.2009, at 20:55, DavidH wrote:
> The gist is that a function is applied to each member of a sequence,
> like map, except that the function also takes a changing state. The
> change to the state is described by a second function.
You might want to look at the state monad, defined in
clojure.contrib.monads. It is an abstraction for the composition of
computations that work on changeable state. Each computation has the
form
(fn [old-state] (list result new-state))
The state monad provides various functions to combine such
computations. Depending on the exact nature of your functions, you
may want to look at m-map, m-seq, or m-chain for your mapping problem.
For an example of how the state monad can be used, see:
http://clojure.googlegroups.com/web/monads.clj
Konrad.
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