Scala: how to check if map has values greater than x?

Question

I was wondering what's the most efficient way to check if a map has a value equal or greater than a certain threshold:

for example, if I get the following map:

val x = Map(2 -> 2, 3 -> 1, 4 -> 1, 7 -> 1)

at the moment I wrote:

x.values.max > 2

Is there a more efficient way? How to check if the Map contains a specific value instead?

Answer 1

You can use scala.collection.Iterator.exists to check whether there exists at least one item of a collection which satisfies a given predicate. To simplify iterating over the Map, you can use scala.collection.Map.valuesIterator:

x.valuesIterator.exists(_ > 2) //=> false
x.valuesIterator.exists(_ > 1) //=> true

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