Kotlin Variables - etechviral

Kotlin Tutorial

Kotlin Classes

Kotlin Variables:

Variables are like containers for storing data/values.
We have two keywords to create variables, var and val and to assign the value to it we use ( = ).

Variables Syntax:

				
					var variableName = value;
val variableName2 = value2;

Just like, let’s say we want to store some values in variables.

				
					var username = "John Doe"
var age = 34
println(username) // will print username
println(age) // will print age

Val vs Var:

Val: The value stored in a variable created with val keyword is immutable (not changeable)
Var: The value stored in a variable created with var keyword is mutable (changeable)

Variable Type:

In Kotlin, the variable can either be declared with type or without type. If it’s declared without type, its type will be specified automatically by Kotlin.
If you want to create a variable that should store text, or number. Look at the example below.

				
					var username = "John Doe" // String (text)
var age = 34 // Int (number)
println(username) // will print text username
println(age) // will print number age

if we specify the appropriate type this will result the same.

				
					var username : String
username = "John Doe"
println(username) // will print text username

You will learn about Data Types in the next chapter.