Object declarations and expressions, companion object, data object in Kotlin
There are times where you want to make sure that only a single instance of a given type can be created, such as if you want to use a single object to coordinate actions across an entire application. In these situations, you can use the object keyword to make an object declaration.
An object declaration defines a class declaration and creates an instance of it in a single statement.
And when you include it in the top level of a source file or package, only one instance of that type will ever be created.
Companion Objects
A companion object is a special type of object declaration defined inside a class. It is used to hold members that belong to the class itself rather than a specific instance, similar to static members in Java.
Any properties or functions declared inside a companion object are shared across all class instances.
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Guide to watch:
00:17 What is the requirement of Object declaration in Kotlin?
01:11 How to declare an Object in Kotlin?
04:30 How to create companion object in Kotlin?
10:05 How to use an object as expressions
11:24 How to create data object in Kotlin?
#object #companionObject #objectDeclaration #expressions #dataObject #singleton #kotlin #advanceKotlin
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