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.)

Answer 2

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

This will do it.

Answer 3

You could try this:

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

println(list1.filterNot(list2.contains(_)))