In Scala 2, methods can be defined inside classes, traits, objects, case classes, and case objects. But it gets better: In Scala 3 they can also be defined outside any of those constructs with a new feature named Toplevel definitions. In short, methods can now be defined anywhere.
Many features of methods are demonstrated in the next section.
Because main methods require a little more explanation, they’re described in the separate section that follows.
Contributors to this page:
Contents
- Introduction
- Scala 3 Features
- Why Scala 3?
- A Taste of Scala
- Hello, World!
- The REPL
- Variables and Data Types
- Control Structures
- Domain Modeling
- Methods
- First-Class Functions
- Objects
- Collections
- Contextual Abstractions
- Toplevel Definitions
- Summary
- A First Look at Types
- Control Structures
- Domain Modeling
- Tools
- OOP Modeling
- FP Modeling
- Methods
- Method Features
- main Methods
- Summary
- Functions
- Anonymous Functions
- Function Variables
- Eta Expansion
- Higher-Order Functions
- Write Your Own map Method
- Creating a Method That Returns a Function
- Summary
- Packaging and Imports
- Scala Collections
- Collections Types
- Collections Methods
- Summary
- Functional Programming
- What is Functional Programming?
- Immutable Values
- Pure Functions
- Functions Are Values
- Functional Error Handling
- Summary
- Types and the Type System
- Inferred Types
- Generics
- Intersection Types
- Union Types
- Algebraic Data Types
- Variance
- Opaque Types
- Structural Types
- Dependent Function Types
- Other Types
- Contextual Abstractions
- Given Instances and Using Clauses
- Type Classes
- Context Bounds
- Given Imports
- Extension Methods
- Implementing Type Classes
- Multiversal Equality
- Implicit Conversions
- Summary
- Concurrency
- Scala Tools
- Interacting with Java
- Scala for Java Developers
- Scala for JavaScript Developers
- Scala for Python Developers