- 01Setting up (what you'll need)
- 02Your first output (println)
- 03Variables (val and var)
- 04Type annotations and basic types
- 05Branching (the if expression)
- 06Repeating (the for expression)
- 07Writing your own function
- 08Repeating (the while loop)
- 09Working with lists (List)
- 10Working with maps (Map)
- 11Classes (object orientation)
- 12case class
- 13Inheritance and traits
- 14Pattern matching (the match expression)
- 15The Option type (null safety)
- 16Higher-order functions, map and filter
- 17object (singletons)
- 18Strings and string interpolation
- 19for comprehensions
- 20[Project] Build a small inventory system
Writing your own function
This lesson covers the basic form for defining a function in Scala.
A function is defined as def name(arg: Type): ReturnType = { ... }. If the body is a single line, the {} can be left out.
The sample code defines def greet(name: String): String = { ... }, which takes a name and returns a greeting built from it.
A common early stumble is forgetting the =. In Scala the body has to be joined on with an = before the {}, and leaving it out changes the meaning.
In professional work, gathering logic into a function in one place, rather than copying it around, is what makes changes and maintenance manageable.
๐งช This site can't compile or run Scala directly, so it checks on the spot whether what you typed matches the reference code (scoring happens entirely in your browser โ nothing is sent anywhere).