How to check if element exist in three lists using scala?

Question

I have following three lists:

List((List(vmnic2),"VM Network",10,"vSwitch0"), (List("vmnic2"),"Management Network",0,"vSwitch0"))
List(List("vmnic2"))
List("VM Network 2", "VM Network 3", "VM Network")

I want to do following:

1) I want to check whether first list contains second list and 2) Any of element from third list matches with second value in any element of first list.

From above three list I want output as

List(List("vmnic2"),"VM Network",10,"vSwitch0")

How do I get above output using scala??

Have you considered using case classes instead of lists? They seem to work better than these heterogenous (Any Lists). — Gábor Bakos
– Gábor Bakos, Commented Nov 17, 2014 at 13:14
Actually I am using case classes for it. I have three different classes for these three lists.. — Vishwas
– Vishwas, Commented Nov 17, 2014 at 13:17
Your example is not valid scala code. That makes it hard for people to understand what you want and help you. — Rüdiger Klaehn
– Rüdiger Klaehn, Commented Nov 17, 2014 at 13:19
What do you mean by "contains" in your first query? That the head of the second list appears as the first element of one of the lists in the first list? — The Archetypal Paul
– The Archetypal Paul, Commented Nov 17, 2014 at 13:20

Sergii Lagutin · Accepted Answer · 2014-11-17 13:22:41Z

2

Try this:

list1.filter(e =>
  e._1.intersect(list2(0)) == list2(0)  // check if first element contains second list
    && list3.contains(e._2))            // check if third list contains second element

answered Nov 17, 2014 at 13:22

Sergii Lagutin

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4 Comments

The Archetypal Paul Over a year ago

Not in your example it isn't. if it can't be known to contain Lists of something, it's a bit more difficult. Please add to your example enough to demonstrate it's a List[Any]

Sergii Lagutin Over a year ago

@Vishwas So what means first list contains second list?

The Archetypal Paul Over a year ago

And if it's List[Any] attempts to pattern match any lists it does contain are defeated by type erasure. I think your design needs re-visiting.

Vishwas Over a year ago

@sergey: how to match if I change list2 to List(("vmnic2","vSwitch0"),("vmnic1",vSwitch1)). In short how do I match above given list to list1 instead of using list2(0)) == list2(0)

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