What is the idiomatic way to deal with null able values, referencing or converting them?

Here is an idiomatic way to deal with nullable values in Kotlin:

Safe Call Operator ?.

The safe call operator ?. is used to safely access properties or call methods on a nullable reference. If the reference is not null, the operation is performed, otherwise null is returned. For example:

val length = person?.name?.length()

This will return the length of the name string if person and person.name are not null, otherwise it will return null.

Elvis Operator ?:

The Elvis operator ?: is used to provide a default value if a nullable expression evaluates to null. For example:

val name = person?.name ?: "Anonymous"

This will assign the value of person.name to name if it is not null, otherwise it will assign the default value "Anonymous".

Non-Null Assertion !!

The non-null assertion !! is used to assert that a nullable expression is not null. If the expression is null, it will throw a NullPointerException. For example: