(take-last n coll)
Returns a seq of the last n items in coll. Depending on the type of coll may be no better than linear time. For vectors, see also subvec.
user=> (take-last 2 [1 2 3 4])
(3 4)
user=> (take-last 2 [4])
(4)
user=> (take-last 2 [])
nil
user=> (take-last 2 nil)
nil
user=> (take-last 0 [1])
nil
user=> (take-last -1 [1])
nil