Lists of attributes of objects in a List

Question

I have a list of objects in Scala. Let's say:

list: List[ClassX] = List(objectA, objectB, objectC)

and the class

class ClassX{

  var attrA
  var attrB

}

Is there a predefined method call, if I want to get attrA of all objects in my list?

You might want to take a look at [this](https://stackoverflow.com/questions/48510844/pondering-name-of-pattern-seen-in-elm-and-if-other-similar-cases/48511108#48511108). — Andrey Tyukin, Mar 07 '18 at 17:02

Jeffrey Chung · Accepted Answer · 2018-03-07T14:40:56.387

4

Use map:

val as = list.map(_.attrA)

as is a List[A], where A is the type of attrA in ClassX.

The above is a shorthand notation for:

val as = list.map(a => a.attrA)

edited Mar 07 '18 at 14:40

answered Mar 07 '18 at 14:35

Jeffrey Chung

1 Answers1