Null-able Types

A. Using lateinit

The lateinit keyword is used for variables that are mutable (var) and will be initialized later. It can only be used with non-nullable types and must be initialized before its first use.

lateinit var name: String

fun initializeName() {

name = "John"

}

fun main() {

initializeName()

println(name) // John

}

B. Using Nullable Types

If you want to declare a variable that might not be initialized immediately, you can use a nullable type by adding a ? after the type. This allows the variable to be null initially.

var age: Int? = null

fun setAge(newAge: Int) {

age = newAge

}

fun main() {

setAge(25)

println(age) // 25

}

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