On Fri, 25 Jul 2014, Richard Barker wrote:
> Using partition-by will give you a lazy sequence.
>
> (defn only-keep-unique-ids [ids]
> (map first (partition-by #(get-form-id-without-timestamp %) ids)))
This will only work if all entries with the same calculated key are
contiguous.
user> (defn prefix [st] (subs st 0 3))
user> (defn firsts-of-partitions [f coll]
(map first (partition-by f coll)))
user> (firsts-of-partitions prefix ["foobar" "foobaz" "wombat" "womble"])
("foobar" "wombat")
user> (firsts-of-partitions prefix ["foobar" "wombat" "foobaz" "womble"])
("foobar" "wombat" "foobaz" "womble")
Paul
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