Most common should take a number about counter-rs HOT 2 CLOSED

most_common already returns all elements sorted by frequency. If you want to truncate the list to size N, you can do most_common().truncate(N). If you just want the Nth, you can do most_common()[N]. If there's a problem with this implementation, it's that it returns too many elements, not too few.

WRT Clone vs Copy: when N: Copy, then the use of Clone isn't any more expensive than just copying the numbers; it compiles down to the same copy. The reason we bound N: Clone instead of Copy is that there are users of this library who need to count large sets, and use a bigint type for N. Bigints are often Clone but not Copy. This is a zero-cost abstraction: a user using the default usize, or any other Copy type , doesn't pay extra for it, but users who need more expansive types can have them.

from counter-rs.

Oh, I forgot about bigint.

from counter-rs.