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clojure.core

Available since 1.0 (source)
  • (sort-by keyfn coll)
  • (sort-by keyfn comp coll)
Returns a sorted sequence of the items in coll, where the sort
order is determined by comparing (keyfn item).  If no comparator is
supplied, uses compare.  comparator must implement
java.util.Comparator.  If coll is a Java array, it will be modified.
To avoid this, sort a copy of the array.