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Learning Scala Programming

You're reading from  Learning Scala Programming

Product type Book
Published in Jan 2018
Publisher Packt
ISBN-13 9781788392822
Pages 426 pages
Edition 1st Edition
Languages
Author (1):
Vikash Sharma Vikash Sharma
Profile icon Vikash Sharma

Table of Contents (21) Chapters

Title Page
Packt Upsell
Contributors
Preface
1. Getting Started with Scala Programming 2. Building Blocks of Scala 3. Shaping our Scala Program 4. Giving Meaning to Programs with Functions 5. Getting Familiar with Scala Collections 6. Object-Oriented Scala Basics 7. Next Steps in Object-Oriented Scala 8. More on Functions 9. Using Powerful Functional Constructs 10. Advanced Functional Programming 11. Working with Implicits and Exceptions 12. Introduction to Akka 13. Concurrent Programming in Scala 14. Programming with Reactive Extensions 15. Testing in Scala 1. Other Books You May Enjoy Index

Wrapper classes


In Scala, we can create our own universe, apart from the native methods provided, we can add our own implementations, which we call Rich Wrapper classes. This is possible because of Implicit Conversions. First, we'll list out some Wrappers available already:

Rich wrappers

To see how it happens, let's see an example:

scala> val x = 10
x: Int = 10

scala> x.isValidByte
res1: Boolean = true

The preceding expression tries to check if the value of x can be converted into a Byte, and suffices range of a Byte, and finds it to be true:

scala> val x = 260
x: Int = 260

scala> x.isValidByte
res2: Boolean = false

scala> val x = 127
x: Int = 127

scala> x.isValidByte
res3: Boolean = true

As you know, range for a Byte is -128 to 127. If you try to assign it to a value that's out of range of a Byte and expect it to behave like a Byte, it won't work. Thus, the result for the preceding expression is false.

Apart from this isValidByte, there are a number of utility methods present...

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