## Chapter 3: A Beginner's Tutorial To Using Functions In Scala

In this section, we will go over how to **define and use functions** in theĀ Scala programming language.

If you recall from the Scala Introduction tutorial, Scala is both an **Object Oriented** and **Functional** programming language. If you are new to functional programming - don't worry :) this chapter will help you learn about the various ways you can **define and use functions** in Scala.

Throughout the tutorials we will use the popular **IntelliJ IDEA** which we've setup in Chapter 1. I hope that by now you are more comfortable using IntelliJ. If not, feel free to review the previous tutorials fromĀ Chapter 1!

In this chapter, we will provide tutorials on the topics below. If none of these make any sense right now, that's OK :)

- Function introduction
- Function with an Option parameter
- Function with implicit parameters
- Function which itself is implicit
- Function which specifies type parameters
- Function which accepts variable arguments
- Function which can be defined as operators
- Function which accepts parameter groups
- Function which takes another function as parameter - Higher Order Functions
- Function which accepts a callback function as its parameter
- Function which are defined as values
- Function which can be composed together
- Function which is tail recursive
- Function which can be partial
- Function which can be nested within another function

So let's get started!

- Functions
- Function With Parameters
- Function With Option Parameters
- Function With Option Return Type
- Function With Implicit Parameter
- Implicit Function
- Typed Function
- Polymorphic Function With Generic Return Type
- Variable Argument Function
- Functions As Symbols
- Function Currying With Parameter Groups
- Higher Order Function
- Higher Order Function - Call By Name Function
- Higher Order Function - With Callback Parameter
- Function Using The Val Keyword Instead Of Def
- Function Composition Using AndThen
- Function Composition Using Compose
- Tail Recursive Function - @annotation.tailrec
- Tail Recursive Function - scala.util.control.TailCalls._
- Trampoline Tail Recursive Function Using scala.util.control.TailCalls._
- Partial Function Using the PartialFunction Trait
- Nested Function

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