how to add values of list in scala

Question

For example list is:

case class User(s: String, value: Int)
case class Name(i: Int, users: List[User])

List(Name(1, List(User("A", 1000), User("B", 500))), Name(2, List(User("A", 800),   User("B", 420))))

Then how to get output using scala: (wanna to add the values: for ex: 1000+ 500 and 800+420)

How to get result in sorted order by value.

you can't get such result because Name(1, 1500) and Name(1, List(User(A, 1000), User(B, 500))) has different classes definitions but same names. You can't have 2 classes in a package with the same name. — ka4eli
– ka4eli, Commented Aug 11, 2015 at 11:27
any result that should be only sum of values: ex: 1000+ 500 and 800+420 — sk1007
– sk1007, Commented Aug 11, 2015 at 11:30

ka4eli · Accepted Answer · 2015-08-11 11:49:51Z

2

Assuming that you defined such classes:

case class User(s: String, value: Int)
case class Name(i: Int, users: List[User])

val list = List(Name(1, List(User("A", 1000), User("B", 500))), Name(2, List(User("A", 800), User("B", 420))))

val result = list.map(_.users.map(_.value).sum)
println(result)

You will get:

List(1500, 1220)

answered Aug 11, 2015 at 11:49

ka4eli

5,4443 gold badges25 silver badges43 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Till Rohrmann · Accepted Answer · 2015-08-11 11:51:48Z

1

You can solve your problem with

case class Name(number: Int, users: List[User])
case class User(name: String, number: Int)

val list = List(Name(1, List(User("A", 1000), User("B", 500))), Name(2, List(User("A", 800), User("B", 420))))

val result = list.map{
  name =>
    val sum = name.users.map {
      _.number
    }.sum
    (name.number, sum)
}

println(result) // List((1,1500), (2,1220))

answered Aug 11, 2015 at 11:51

Till Rohrmann

13.4k2 gold badges27 silver badges52 bronze badges

Collectives™ on Stack Overflow

how to add values of list in scala

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related