Once you notice that you usually need a fast solution. The easiest solution
is to just pass around an instance of java.util.Random which you create
with the desired seed. Another options is to have a constructor function
returning a "rand" function.
(defn prng [seed]
(let [rnd (java.util.Random. (long seed))]
(fn rand [] (.nextDouble rnd))))
You can specify different arities as you need them. But obviously this is
more limited than just passing around the Random object since you can't
choose between the next* methods.
But having a built-in rebindable (thread-local) "rand" is preferable in the
long run.
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