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Learn Scala from Scratch

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Getting to Know Scala

Scala: A History A 'Scalable' Language A Featurette: Scala Features Who's Using Scala?

Variables and Types

Variables in Scala Printing in Scala Immutable Variables Mutable Variables Data Types Challenge: Declaring a Variable Solution Review: Declaring a Variable Type Casting in Scala Challenge: Type Casting Solution Review: Type Casting Strings and Other Literals Type Inference Chapter Quiz

Operating with Operators

A Brief Introduction to Methods and Functions An Introduction to Operators Arithmetic Operators Relational Operators Logical Operators Bitwise Operators Assignment Operators Challenge: Using Multiple Operators Solution Review: Using Multiple Operators Operator Precedence Challenge: Temperature Conversion Solution Review: Temperature Conversion Chapter Quiz

Strings and How to Use Them

An Introduction String Interpolation with 's'Challenge: Embed a Variable in a String Solution Review: Embed a Variable in a String String Interpolation with 'f'Challenge: Formatting Strings Solution Review: Formatting Strings String Interpolation with 'raw'Testing String Equality Creating Multiline Strings Splitting Strings Finding Patterns in Strings Replacing Patterns in Strings Methods for Comparing Strings Challenge: Searching a String Solution Review: Searching a String Chapter Quiz

Scala's Collection Library

A Brief Introduction to Objects and Classes An Introduction to the Collection Library foreach: A Collection Method The Array Collection ArrayBuffers Challenge: Array of Integers Solution Review: Array of Integers Working with Lists Challenge: Appending an Element to a List Solution Review: Appending an Element to a List Getting Started with Vectors Creating a Range of Numbers LazyList: A Lazy Version of List Chapter Quiz

Control Structures

Control Structures in Scala Decide with if Optimizing an if Program Challenge: Pass or Fail Solution Review: Pass or Fail Loop with while Challenge: Oven is Ready!Solution Review: Oven is Ready!Iterate with for Challenge: Array of Squares Solution Review: Array of Squares Exception Handling with try Pattern Matching with Match Challenge: Color Wheel Solution Review: Color Wheel Types of Patterns Chapter Quiz

Getting Started with Functions

Defining a Function Challenge: Absolute Value Solution Review: Absolute Value Evaluation Strategies Quiz: CBV or CBN?Code Termination Recursive Functions Challenge: Sum of Lists Solution Review: Sum of Lists Learning by Example: Newton's Method Blocks Challenge: Max with Nested Functions Solution Review: Max with Nested Functions Lexical Scope Tail Recursion Challenge: Tail Recursion Solution Review: Tail Recursion Chapter Quiz

Higher-Order Functions

What are Higher-Order Functions?Learning by Example: Summation Summation with Higher-Order Functions Challenge: Write your First Higher-Order Function Solution Review: Write Your First Higher-Order Function Anonymous Functions Summation with Anonymous Functions Challenge: Anonymous Functions Solution Review: Anonymous Functions Functions Returning Functions Currying Summation with Currying Expanding a Multiple Parameter List Challenge: Using a Curried Function Solution Review: Using a Curried Function Chapter Quiz

Classes and Objects

Creating a Class in Scala

Objects of a Class

Creating an Object Using Constructor Parameters

Learning by Example: checksum

Singleton Objects: Companion

Singleton Objects: Standalone

Conclusion

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Objects of a Class

Objects of a Class

In this lesson, you will create your first object of a class and learn how to set its fields and call its methods.

Instantiating a Class

Once a class has been defined, you can create objects from the class blueprint using the new keyword followed by the class identifier.

We usually don’t create objects for the sake of just creating them, rather, we want to work with them in some way. For this reason, we assign the object to a variable. Let’s instantiate our Person class.

For ease, the code for creating the class is also provided below.

class Person{
  var name: String = "temp"
  var gender: String = "temp"
  var age: Int = 0
  def walking = println(s"$name is walking")
  def talking = println(s"$name is talking")
}
// Creating an object of the Person class
val firstPerson = new Person

Setting the Field Values

Now that we have our object firstPerson, let’s set its field values. To do so, we call the field we wish to set on the object whose field we wish to set.

Let’s set the name, gender, and age of ...