Channels
#stdlib
Title
g
gregorbg
01/08/2020, 7:06 PMWhat would be an idiomatic way to convert a
Map<K, List<V>>Map<V, K>List<V>K{"foo": [1, 2, 3]}{1: "foo", 2: "foo", 3: "foo"}Currently I have:
Copy code
myMap.entries
.flatMap { e ->
e.value.map { it to e.key }
}.toMap()d
Dico
01/09/2020, 10:44 AMmyMap.entries.fold(HashMap()) { m, (k, v) -> v.associateWithTo(m) { k } }Something like that perhaps?
Probably doesn't compile but you get the drill
j
jimn
01/09/2020, 10:50 AMmyMap.entries.map{(k,v)->v.map{it to k}}.toMap()
oh my bad missed the List<V> explicit param.
2 Views