Functional Kotlin

Compile time constants

So, how can we overcome this? How can we enforce immutability? The const val properties are here to help us. Just modify val myString with const val myString and you cannot implement the custom getter.

While val properties are read-only variables, const val on the other hand are compile time constants. You cannot assign the outcome (result) of a function to const val. Let's discuss some of the differences between val and const val:

• The val properties are read-only variables, while const val are compile time constants
• The val properties can have custom getters, but const val cannot
• We can have val properties anywhere in our Kotlin code, inside functions, as a class member, anywhere, but const val has to be a top-level ...