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Your implementation seems wasteful, even if you wanted to use drop + count, why not substract the number to keep to the count, which avoids an extra temporary collection.

Thanks.
Yes，this is better: (drop (- (count coll) n) coll).
Don't know why no people did change many this like codes in Clojure core since 1.0.

In this particular case, I believe that (count coll) will scan linearly through the coll one time, then (drop coll) will scan linearly through the coll a second time. The existing implementation appears like it will only do a linear scan through the coll one time. Performance is often a significant concern in the implementation of Clojure's core functions.

Thanks, agree with you .