Getting all key value pairs having the maximum value from a Scala map

Question

I have seen a similar post here here which is giving a single key-value pair which has maximum value in the entire Map.

But I would like to get List of pairs which has maximum value(maximum value is same for many pairs).

Ex : Map(1 -> 7, 2 -> 1, 4 -> 7, 3 -> 2)

Expected Output : List(1 -> 7, 4 -> 7)

This (Map(1 -> 7, 2 -> 1, 4 -> 7, 3 -> 2).maxBy(x => x._2)) will give only first occurrence 1 -> 7

Thanks @vindev . That helps me – Praveen L Apr 12 '18 at 09:34 — Praveen L, Apr 12 '18 at 09:34

score 1 · Accepted Answer · answered Apr 12 '18 at 09:42

1

Using map.filter(_._2 == map.values.max) will do the trick.

answered Apr 12 '18 at 09:42

vindev

score 1 · Answer 2 · answered Apr 18 '18 at 09:55

1

val maxValue = map.values.max
map.filter(_._2 == maxValue).toList

answered Apr 18 '18 at 09:55

Peter Fitch

2 Answers2