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Learning Scala Programming

You're reading from   Learning Scala Programming Object-oriented programming meets functional reactive to create Scalable and Concurrent programs

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Product type Paperback
Published in Jan 2018
Publisher Packt
ISBN-13 9781788392822
Length 426 pages
Edition 1st Edition
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Author (1):
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Vikash Sharma Vikash Sharma
Author Profile Icon Vikash Sharma
Vikash Sharma
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Table of Contents (16) Chapters Close

1. Getting Started with Scala Programming FREE CHAPTER 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 16. Other Books You May Enjoy

Function syntax

Functions in Scala can be written using the def keyword, followed by the name of the function, with some arguments supplied as inputs to the function. Let's take a look at the generic syntax for a function:

modifiers... 
def function_name(arg1: arg1_type, arg2: arg2_type,...): return_type = ???

The preceding syntax shows the generic function signature in Scala. First, we give modifiers for the function. Modifiers can be understood as properties defined for the function. Modifiers come in different forms. A few of them are as follows:

  • Annotations
  • Override modifier
  • Access modifiers (private, and so on)
  • The final keyword

It's recommended practice to use the preceding modifiers on an as-needed basis and in the given order. After specifying modifiers, we use the def keyword to denote a function followed by the name of the function. After giving the function...

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