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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 literals

We can pass a function in the form of a literal to another function, to work for us. Let's take the same compareIntegers function example:

def compareIntegersV6(value1: Int = 10, value2: Int): Int = ??? 

We know what our function is supposed to do: take two integer numbers as input and return an integer response telling us the result of our comparison. If we take a look at the abstract form of our function, it will look like this:

(value1: Int, value2: Int) => Int     

This means that the function is expecting two integers, and returning an integer response; our need is the same. It's an abstract form that indicates that elements on the left are inputs and elements on the right are the response type for our function. We can say that this is in its literal form, also called function literals. Hence, it's also possible to assign this...

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