Properties in Kotlin Classes

What is a Property?

In Kotlin, a property is a value or state that belongs to an object or class. Properties are also known as fields in other programming languages. They allow you to store data inside an object, such as a person's name, a book's title, or a car's speed. Each object can have its own unique values for these properties.

Declaring Properties

You declare properties inside a class using the var or val keywords. Use var if the property can change, or val if it should be read-only after it is set. Properties are usually given a type, such as String or Int, and can be initialized with a value or left to be set later.

You can access and modify properties of an object using dot notation. In the code above, the Book class has two properties: title and author, both declared with var so they can be changed. When you create a Book object, you provide values for these properties. To read a property, use the object's name followed by a dot and the property name, like book.title. To change a property, assign a new value in the same way, such as book.title = "Animal Farm". This makes it easy to work with the data stored in your objects.