Kotlin Tutorial
Kotlin Variables: Types, Examples, Declare, var vs val
Table of Contents
- What is Kotlin Variable?
- Types of Variables in Kotlin Language
- How to Declare a Variable in Kotlin?
- Kotlin var vs val (Difference)
- Scope of a Kotlin Variable
- Naming Convention of Kotlin Variables
- Kotlin Basic Variable Types
- Get Type of Variable in Kotlin
- Kotlin Environment Variables
- Kotlin Class Variable
- Kotlin Full Course Video for Beginners [FREE]
Kotlin Full Course Video for Beginners [FREE]
Kotlin Variable FAQs
No, you cannot change the type of a variable after it's declared. Variable types are determined at the time of declaration and cannot be modified later.
Type inference is a feature in Kotlin where the compiler can automatically determine the data type of a variable based on the assigned value. This often allows you to omit explicit type declarations, making code more concise.
You can declare a nullable variable by appending a ? to the type declaration. For example: val nullableName: String? = null. This allows the variable to hold either a non-null value of the specified type or a null value.
The scope of a variable in Kotlin defines where in your code the variable can be accessed or used. Variables have different scopes depending on where they are declared, such as block scope, function scope, class scope, etc.
Top-level variables are variables declared outside of any class or function, typically at the top level of a Kotlin file. They can be accessed from anywhere within the same file and have a module-level scope.
Constants in Kotlin are typically declared using the val keyword with uppercase letters and underscores to separate words. For example: val MAX_VALUE = 100.
Yes, you can change the contents of a val variable if it's a mutable object (e.g., a mutable list). The val itself remains constant, but the internal state of the object can be modified.
