• val/var/def/lazy
• String/Int
• object/trait/class (abstract?)
• Constructor and public values
• The apply method / everything is a function (e.g. +)
• Companion object
• case class
• apply / copy
• Tuples
• ScalaTest
• sbt
• sbt run / sbt test
• open sbt console
• open idea scratch

• Write a case class containing a position and a username (both are strings)
  • Write a function to replace the position
  • Obviously with tests (verify the original case class wasn't changed)
  • add a counter field that counts how many times the object changed position
• Add a new case class that only contains the username
  • both case classes need to implement the same trait (trait contains the username)

• if
• Match
• Collections
  • List
• Monads
  • Either
  • Try
  • Option
• for-comprehension

https://github.com/trayio/scala-be-interview/blob/master/task5/src/main/scala/io/tray/UserScoreService.scala https://github.com/trayio/scala-be-interview/blob/master/task1/src/main/scala/io/tray/services/WorkflowService.scala

• Implicits
• currying
• partial function
• Futures
• Value Classes
• Tagged types
• Pure config

[https://github.com/trayio/scala-be-interview/blob/master/task2/src/main/scala/io/tray/services/UserService.scala]