Internship← Scala Programming learning pathScala Programming · Module 6 of 10
Classes, objects and traits
Scala models data with classes, case classes, objects and traits.
📖 Key ideas
- class Student(name: String) defines a class with a constructor.
- case class gives equality, toString, copy and pattern matching for free.
- object creates a single instance (a singleton).
- Traits share behaviour across classes, like interfaces with code.
- Companion objects hold factory methods for a class.
💡 Real-life example: A case class is a pre-printed ID card: it already knows how to compare, copy and display itself.
case classData class with free equality and copy
objectA singleton instance
traitReusable behaviour mixed into classes
Companion objectObject with the same name as a class