Scala difference of two lists

Question

I have two lists:

val list1 = List(\"word1\",\"word2\",\"word2\",\"word3\",\"word1\")
val list2 = List(\"word1\",\"word4\")

I want to remove al

Answer 1

You can

val unwanted = list2.toSet
list1.filterNot(unwanted)

to remove all items in list2. (You don't need knowledge of duplicates in list2.)