scalatutorials

Conditions · 22 of 42

Match as a Switch

Pattern matching will be familiar to anyone coming from a Haskell background, however it might look a bit weird at first for anyone coming from imperative languages.

Pattern matching in its most basic form, can look like an extended switch, with some differences:

  • The match keyword comes after the variable (selection match compared to switch(selection))
  • There is no need for break;
  • There is no fall through
  • The default case is case _ (or case x where x can be any lower case identifier, more about it in the next slides)

Pattern matching can be very powerful beyond a switch replacement, and will be explained in later slides.

See also

val selection = "One"
selection match {
  case "One" => println("You selected option one!")
  case "Two" => println("You selected option two!")
  case _ => println("You selected something else: ")
}

Contents

Scala basics

  1. Overview
  2. Scalculator
  3. Operators are methods
  4. Variables
  5. Final variables
  6. Printing values
  7. String interpolation
  8. String formatting
  9. Useful operations
  10. Method definition
  11. Method definition 2
  12. Method definition 3
  13. Anonymous functions
  14. Anonymous functions 2
  15. Return multiple values
  16. Declare multiple variables
  17. Assign multiple variables
  18. Loops using while
  19. Loops using for
  20. Loops without loops
  21. If
  22. Match as a switch
  23. Arrays
  24. Lists
  25. Sets
  26. Maps
  27. Mutable collections
  28. Collections: accessing elements
  29. Collections: concatenation
  30. Mutable collection operations
  31. Immutable collections with var
  32. Collections: useful methods
  33. Classes
  34. Classes, continued

What's new in Scala 3

  1. Scala 3: what changed
  2. Optional braces & new control syntax
  3. Top-level definitions & @main
  4. Enums & ADTs
  5. Extension methods
  6. given & using
  7. Union & intersection types
  8. Smaller niceties