unionsWith

The union of a list of maps, with a combining operation.

unionsWith (++) [(fromList [(5, "a"), (3, "b")]), (fromList [(5, "A"), (7, "C")]), (fromList [(5, "A3"), (3, "B3")])]
== fromList [(3, "bB3"), (5, "aAA3"), (7, "C")]

The union of a list of maps, with a combining operation: (unionsWith f == foldl (unionWith f) empty).

unionsWith (++) [(fromList [(5, "a"), (3, "b")]), (fromList [(5, "A"), (7, "C")]), (fromList [(5, "A3"), (3, "B3")])]
== fromList [(3, "bB3"), (5, "aAA3"), (7, "C")]

The union of a list of maps, with a combining operation.

unionsWith (++) [(fromList [(5, "a"), (3, "b")]), (fromList [(5, "A"), (7, "C")]), (fromList [(5, "A3"), (3, "B3")])]
== fromList [(3, "bB3"), (5, "aAA3"), (7, "C")]

Combine a list of maps. When a key exists in two different maps, apply a function to both of the values and use the result of that as the value of the key in the resulting map.

Union. The function is used to combine edge labels for edges that occur in several graphs. O((n + e) log n (where n and e refer to the resulting graph).

The union of a list of maps, with a combining operation.

The union of a non-empty list of maps, with a combining operation: (unionsWith f == foldl1 (unionWith f)).

unionsWith (++) (fromList ((5, "a") :| [(3, "b")]) :| [fromList ((5, "A") :| [(7, "C")]), fromList ((5, "A3") :| [(3, "B3")])])
== fromList ((3, "bB3") :| [(5, "aAA3"), (7, "C")])

The union of a non-empty list of maps, with a combining operation: (unionsWith f == foldl1 (unionWith f)).

unionsWith (++) (fromList ((5, "a") :| [(3, "b")]) :| [fromList ((5, "A") :| [(7, "C")]), fromList ((5, "A3") :| [(3, "B3")])])
== fromList ((3, "bB3") :| [(5, "aAA3"), (7, "C")])

The union of a list of maps, with a combining operation: (unionsWith f == foldl (unionWith f) empty).

The union of a list of maps, with a combining operation: (unionsWith f == foldl (unionWith f) empty).

Union a number of tables with a combining function for duplicate keys.

unionsWith (++) [fromList [(1,'a',"b"),(1,'b',"c"),(2,'a',"b")], fromList [(1,'a',"c"),(2,'b',"d"),(3,'c',"e")]]
=== fromList [(1,'a',"bc"),(1,'b',"c"),(2,'a',"b"),(2,'b',"d"),(3,'c',"e")]

The union of a list of maps, with a combining operation: (unionsWithKey f == foldl (unionWithKey f) empty).

The union of a list of maps, with a combining operation: (unionsWithKey f == foldl (unionWithKey f) empty).

Union a number of tables with a combining function for duplicate keys.

let f r c a a' = show r ++ ":" ++ show c ++ ":" ++ a ++ "|" ++ a' in do
unionsWithKeys f [fromList [(1,'a',"b"),(1,'b',"c"),(2,'a',"b")], fromList [(1,'a',"c"),(2,'b',"d"),(3,'c',"e")]]
=== fromList [(1,'a',"1:'a':b|c"),(1,'b',"c"),(2,'a',"b"),(2,'b',"d"),(3,'c',"e")]