Scala difference of two lists

You can

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

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

You could try this:

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

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

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

This will do it.

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