public static < K , V , A > A ifPresentApply ( Map < K , V > map , K key , Function < ? super V , ? extends A > function ) { if ( map instanceof UnsortedMapIterable ) { return ( ( MapIterable < K , V > ) map ) . ifPresentApply ( key , function ) ; } V result = map . get ( key ) ; return MapIterate . isAbsent ( result , map , key ) ? null : function . valueOf ( result ) ; }
If there is a value in the Map tat the specified key return the result of applying the specified Function on the value otherwise return null .