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mkremins/weighted_choice.clj

Created October 8, 2014 20:04
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Weighted random choice
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weighted_choice.clj
(defn weighted-choice
"Given a map `choices {outcome weight}`, returns a randomly chosen `outcome`.
The likelihood that a particular `outcome` will be chosen is proportional to
its assigned `weight`."
[choices]
(->> choices
(mapcat (fn [[outcome weight]] (repeat weight outcome)))
rand-nth))
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