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  • Book Overview & Buying Professional Scala
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Professional Scala

Professional Scala

By : Hartmann, Shevchenko
4.2 (13)
Buy this Book
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Professional Scala

Professional Scala

4.2 (13)
By: Hartmann, Shevchenko
Buy this Book

Overview of this book

This book teaches you how to build and contribute to Scala programs, recognizing common patterns and techniques used with the language. You’ll learn how to write concise, functional code with Scala. After an introduction to core concepts, syntax, and writing example applications with scalac, you’ll learn about the Scala Collections API and how the language handles type safety via static types out-of-the-box. You’ll then learn about advanced functional programming patterns, and how you can write your own Domain Specific Languages (DSLs). By the end of the book, you’ll be equipped with the skills you need to successfully build smart, efficient applications in Scala that can be compiled to the JVM.
Table of Contents (10 chapters)
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Preface
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Preface
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Who This Book Is For
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What This Book Covers
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Conventions
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Installation and Setup
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Installing IntelliJ IDE
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Installing Scala plugin (make heading)
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Reader Feedback
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Customer Support
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1
1. Setting up the Development Environment
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1. Setting up the Development Environment
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Simple Program
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Structure of a Scala Project
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Base Syntax
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Unit Testing
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Summary
2
2. Basic Language Features
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2. Basic Language Features
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Objects, Classes, and Traits
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OO in Our Chatbot
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Function Calls
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Summary
3
3. Functions
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3. Functions
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Functions
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Exploring Pattern Matching
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Partial Functions in Practice
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Summary
4
4. Scala Collections
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4. Scala Collections
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Working with Lists
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Abstracting on Sequences
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Other Collections
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Summary
5
5. Scala Type System
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5. Scala Type System
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Type Basics and Polymorphism
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Variance
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Advanced Types
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Summary
6
6. Implicits
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6. Implicits
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Implicit Parameters and Implicit Conversions
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Ad Hoc Polymorphism and Type Classes
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Summary
7
7. Functional Idioms
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7. Functional Idioms
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Introduction to Functional Programming Concepts
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Functional Design Patterns
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Popular Libraries
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Summary
8
8. Domain Specific Languages
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8. Domain Specific Languages
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DSLs and Types of DSLs
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ScalaTest – A Popular DSL
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Language Features for Writing DSLs
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Writing a Small DSL
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Beyond This Book
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Summary
9
Index
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Index

OO in Our Chatbot

Now that you know the theoretical basics, let's look at these facilities and how they are used in our program. Let's open Lesson 2/3-project in our IDE and extend our chatbot, which was developed in the previous chapter.

Decoupling Logic and Environment

To do this, we must decouple the environment and logic, and integrate only one in the main method.

Let's open the EffectsProvider class:

Note

For full code, refer to Code Snippets/Lesson 2.scala file. 

trait EffectsProvider extends TimeProvider {

 def input: UserInput

 def output: UserOutput

}

object DefaultEffects extends EffectsProvider
{
 override def input: UserInput = ConsoleInput

 override def output: UserOutput = ConsoleOutput

 override def currentTime(): LocalTime = LocalTime.now()

 override def currentDate(): LocalDate = LocalDate.now()
}

Here, we encapsulate all of the effects into our traits, which can have different implementations.

For example, let's look at UserOutput:

For full...

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