What is the difference between “const” and “val”?

Question

I have recently read about the const keyword, and I\'m so confused! I can\'t find any difference between const and the val keyword, I

Answer 1

val

Kotlin val keyword is for read-only properties in comparison with Kotlin var keyword. The other name for read-only property is immutable.

Kotlin code:

val variation: Long = 100L

Java equivalent looks like this:

final Long variation = 100L;

const val

We use const keyword for immutable properties too. const is used for properties that are known at compile-time. That's the difference. Take into consideration that const property must be declared globally.

Kotlin code (in playground):

const val WEBSITE_NAME: String = "Google"

fun main() {    
    println(WEBSITE_NAME)
}

Java code (in playground):

class Playground {

    final static String WEBSITE_NAME = "Google";

    public static void main(String[ ] args) {
        System.out.println(WEBSITE_NAME);
    }
}