Scala 3
3.8.0-RC1-bin-20250822-658c8bd-NIGHTLY
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Scala 3
Learn
Install
Playground
Find A Library
Community
Blog
Docs
API
Reference
New Types
Intersection Types
Union Types
Type Lambdas
Match Types
Dependent Function Types
Polymorphic Function Types
Enums
Enumerations
Algebraic Data Types
Translation of Enums and ADTs
Contextual Abstractions
Given Instances
Using Clauses
Context Bounds
Deferred Givens
Importing Givens
Other Forms Of Givens
Extension Methods
Right-Associative Extension Methods: Details
Implementing Type classes
Type Class Derivation
How to write a type class `derived` method using macros
Multiversal Equality
Context Functions
Implicit Conversions
By-Name Context Parameters
Relationship with Scala 2 Implicits
Metaprogramming
Inline
Compile-time operations
Macros
The Meta-theory of Symmetric Metaprogramming
Run-Time Multi-Stage Programming
Reflection
TASTy Inspection
Other New Features
Trait Parameters
Transparent Traits and Classes
Universal Apply Methods
Export Clauses
Opaque Type Aliases
Opaque Type Aliases: More Details
Named Tuples
Open Classes
Parameter Untupling
Kind Polymorphism
The Matchable Trait
The @threadUnsafe annotation
The @targetName annotation
New Control Syntax
Optional Braces
Safe Initialization
TypeTest
Experimental Definitions
Preview Definitions
Binary Integer Literals
Toplevel Definitions
Better fors
The runtimeChecked method
Other Changed Features
Numeric Literals
Programmatic Structural Types
Rules for Operators
Wildcard Arguments in Types
Imports
Changes in Type Inference
Changes in Implicit Resolution
Implicit Conversions
Changes in Overload Resolution
Match Expressions
Vararg Splices
Pattern Bindings
Option-less pattern matching
Automatic Eta Expansion
Changes in Compiler Plugins
Lazy Vals Initialization
Main Methods
Escapes in interpolations
Dropped Features
Dropped: DelayedInit
Dropped: Scala 2 Macros
Dropped: Existential Types
Dropped: General Type Projection
Dropped: Do-While
Dropped: Procedure Syntax
Dropped: Early Initializers
Dropped: Class Shadowing
Dropped: Limit 22
Dropped: XML Literals
Dropped: Symbol Literals
Dropped: Auto-Application
Dropped: Weak Conformance
Deprecated: Nonlocal Returns
Dropped: private[this] and protected[this]
Dropped: Wildcard Initializer
Preview
Experimental
CanThrow Capabilities
Erased Definitions
Named Type Arguments
Numeric Literals
Explicit Nulls
MainAnnotation
The `into` Type and Modifier
Capture Checking
Capture Checking Basics
Capture Checking of Classes
Capability Polymorphism
Scoped Caps
Capability Classifiers
Checked Exceptions
Separation Checking
How to Use the Capture Checker
Capture Checking Internals
Pure Function Syntax
Tupled Function
Modularity Improvements
Better Support for Type Classes
Automatic Parameter Unrolling
Reference-able Package Objects
Quoted Patterns with Polymorphic Functions
Scala 3 Syntax Summary
Language Versions
Source Compatibility
Binary Compatibility
Soft Keywords
A Classification of Proposed Language Features
Contributing
Getting Started
Setting up your IDE
Diagnosing your issue
Reproducing an Issue
Finding the Cause of an Issue
Common Issue Locations
Debugging the Compiler
Debugging with your IDE
How to Inspect Values
Other Debugging Techniques
Testing Your Changes
Scaladoc
Community Build
Sending in a pull request
Command Cheatsheet
Procedures
Release Procedure
Test Vulpix Framework
High Level Architecture
Compiler Overview
Contexts
Compiler Phases
Compiler Types
Time in the Compiler
Symbols
Internals
Backend Internals
Classpaths
Contexts
Differences between Scalac and Dotty
Higher-Kinded Types in Dotty
Dotty Overall Structure
Explicit Nulls
Dotc's concept of time
Scala 3 Syntax Summary
Type System
Dotty Internals 1: Trees & Symbols (Meeting Notes)
Debug Macros
GADTs - Broad overview
Code Coverage for Scala 3
Best Effort Compilation
Blog (archive)
Scala 3.0.1-RC2 – backports of critical bugfixes
Scala 3.0.1-RC1 – further stabilising the compiler
Scala 3.0.0-RC3 – bug fixes for 3.0.0 stable
Scala 3.0.0-RC2 – getting ready for 3.0.0
Scala 3.0.0-RC1 – first release candidate is here
Scala 3.0.0-M3: developer's preview before RC1
Scala 3.0.0-M1 is here
Dotty becomes Scala 3
Announcing Dotty 0.27.0-RC1 - ScalaJS, performance, stability
Announcing Dotty 0.26.0-RC1 - unified extension methods and more
Announcing Dotty 0.25.0-RC2 - speed-up of givens and change in the tuple API
Announcing Dotty 0.24.0-RC1 - 2.13.2 standard library, better error messages and more
Announcing Dotty 0.23.0-RC1 - safe initialization checks, type-level bitwise operations and more
Announcing Dotty 0.22.0-RC1 - syntactic enhancements, type-level arithmetic and more
Announcing Dotty 0.21.0-RC1 - explicit nulls, new syntax for `match` and conditional givens, and more
Announcing Dotty 0.20.0-RC1 – `with` starting indentation blocks, inline given specializations and more
Announcing Dotty 0.19.0-RC1 – further refinements of the syntax and the migration to 2.13.1 standard library
Announcing Dotty 0.18.1-RC1 – switch to the 2.13 standard library, indentation-based syntax and other experiments
Announcing Dotty 0.17.0-RC1 – new implicit scoping rules and more
Announcing Dotty 0.16.0-RC3 – the Scala Days 2019 Release
Announcing Dotty 0.15.0-RC1 – the fully bootstrapped compiler
Announcing Dotty 0.14.0-RC1 with export, immutable arrays, creator applications and more
Announcing Dotty 0.13.0-RC1 with Spark support, top level definitions and redesigned implicits
Announcing Dotty 0.12.0-RC1
Announcing Dotty 0.11.0-RC1
Announcing Dotty 0.10.0-RC1
Announcing Dotty 0.9.0-RC1
Announcing Dotty 0.7.0 and 0.8.0-RC1
Announcing Dotty 0.6.0 and 0.7.0-RC1
Announcing Dotty 0.5.0-RC1
Announcing Dotty 0.4.0-RC1
Announcing Dotty 0.3.0-RC2
Announcing Dotty 0.2.0-RC1, with new optimizations, improved stability and IDE support
Announcing Dotty 0.1.2-RC1, a major step towards Scala 3
Implicit Function Types
Multiversal Equality for Scala
Scaling DOT to Scala - Soundness
The Essence of Scala
New Year Resolutions
We got liftoff!
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