Milline on vahe muutujate deklaratsioonide vahel var ja val Kotlinis?

In Kotlin, var and val are used to declare variables, but they have a fundamental difference:

• var — declares a mutable variable. The value of such a variable can be changed after initialization.
• val — declares an immutable variable, similar to a constant. Once assigned a value, it cannot be changed.

Example:

var mutableVar = 10
mutableVar = 20  // allowed

val immutableVal = 30
// immutableVal = 40  // compilation error

It is recommended to use val when the value should not change, as it increases code safety and readability.