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janet/examples/frequencies.dst

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# Get the number of occurences of elements in a set
(defn frequencies
"Get the number of occurences of each value in a sequence."
[s]
(let [freqs @{}
_ (foreach s (fn [x]
(let [n (get freqs x)]
(put freqs x (if n (+ 1 n) 1)))))]
freqs))