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Scala smoothly integrates object-oriented and functional programming. It is designed to express common programming patterns in a consise, elegant, and type-safe way. Scala introduces several innovative language constructs. For instance:
- Abstract types and mixin composition unify concepts from object and module systems.
- Pattern matching over class hierarchies unifies functional and object-oriented data access. It greatly simplifies the processing of XML trees.
- A flexible syntax and type system enables the construction of advanced libraries and new domain specific languages.
At the same time, Scala is compatible with Java. Java libraries and frameworks can be used without glue code or additional declarations.
This document introduces Scala in an informal way, through a sequence of examples.
Chapters 2 and 3 highlight some of the features that make Scala interesting. The following chapters introduce the language constructs of Scala in a more thorough way, starting with simple expressions and functions, and working up through objects and classes, lists and streams, mutable state, pattern matching to more complete examples that show interesting programming techniques. The present informal exposition is meant to be complemented by the Scala Language Reference Manual which specifies Scala in a more detailed and precise way.
''Acknowledgment.'' We owe a great debt to Abelson’s and Sussman’s wonderful book “Structure and Interpretation of Computer Programs”[ASS96]. Many of their examples and exercises are also present here. Of course, the working language has in each case been changed from Scheme to Scala. Furthermore, the examples make use of Scala’s object-oriented constructs where appropriate.
* Chapter 1 Introduction
Scala smoothly integrates object-oriented and functional programming. It is designed to express common programming patterns in a consise, elegant, and type-safe way. Scala introduces several innovative language constructs. For instance:
- Abstract types and mixin composition unify concepts from object and module systems.
- Pattern matching over class hierarchies unifies functional and object-oriented data access. It greatly simplifies the processing of XML trees.
- A flexible syntax and type system enables the construction of advanced libraries and new domain specific languages.
At the same time, Scala is compatible with Java. Java libraries and frameworks can be used without glue code or additional declarations.
This document introduces Scala in an informal way, through a sequence of examples.
Chapters 2 and 3 highlight some of the features that make Scala interesting. The following chapters introduce the language constructs of Scala in a more thorough way, starting with simple expressions and functions, and working up through objects and classes, lists and streams, mutable state, pattern matching to more complete examples that show interesting programming techniques. The present informal exposition is meant to be complemented by the Scala Language Reference Manual which specifies Scala in a more detailed and precise way.
''Acknowledgment.'' We owe a great debt to Abelson’s and Sussman’s wonderful book “Structure and Interpretation of Computer Programs”[ASS96]. Many of their examples and exercises are also present here. Of course, the working language has in each case been changed from Scheme to Scala. Furthermore, the examples make use of Scala’s object-oriented constructs where appropriate.
