Need to get the list from Option Vector

Question

I have a vector of option of List of Tuple like

val x = Vector(
Some(List(("x",2))),
Some(List(("x",2),("y",3))),
None,
Some(List(("x",2),("z",2))),
Some(List(("x",2),("z",2))),
None)

How to get the list from the above vector

Updated:

The final purpose is to get the total count of element in the list (we have three element only x or y or z).

like total count of x would return 8 and total count of y would return 3 and total count of z would return 4

like

val totalx = x.flatten.filter ....

And specification, what you're expecting together with your attempt would be nice — Andronicus, Apr 16 '19 at 05:02
Sorry, I don't see a `Vector` here, and `some` doesn't compile. can you provide the valid code? — Gal Naor, Apr 16 '19 at 05:02

score 0 · Answer 1 · answered Apr 16 '19 at 05:54

0

Sorry i got the answer

x.flatten.flatten.filter(x => x._1 == "y").map(x => x._2).sum

used flatten to remove the none and then used flatten again to get all tuple flatten then filter and summing up

answered Apr 16 '19 at 05:54

score 0 · Answer 2 · answered Apr 16 '19 at 06:02

0

x.flatMap {
  case Some(l) => l.filter(_._1=="x").map(_._2)
  case None => List(0)}.sum

answered Apr 16 '19 at 06:02

Can you provide some explanation how this solves the OP's problem. [Explaining entirely code-based answers](https://meta.stackoverflow.com/q/392712/3124333) – SiKing Apr 20 '23 at 21:54
Yes - but it is pretty self-explanatory. Map over the outer list when there's a list map over that while filtering the needed tuples and taking their values, flatten the results, and sum the resulting list – Arnon Rotem-Gal-Oz Apr 22 '23 at 08:23

2 Answers2