In Scala, how to check if a Map contains all entries from another Map?

Question

Total newb question. Say I have 2 maps

val map1 = Map(\"ram\"->\"2gb\", \"size\"->\"15\", \"color\"->\"red\", \"fruit\"->\"strawberry\")
val map2 =          


        

Answer 1

You can convert a Map to a Set and then apply the subsetOf method.

val map1 = Map("ram"->"2gb", "size"->"15", "color"->"red", "fruit"->"strawberry")
val map2 = Map("ram"->"2gb", "size"->"15", "color"->"red")

map2.toSet subsetOf map1.toSet // res0: Boolean = true

Answer 2

If you don't want to duplicate your collections,

map2.forall{ case (k,v) => map1.get(k).exists(_ == v) }

You check everything in map2 by looking up the key in map1, returning an option, and checking that the value is there and what it should be.