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A feature that makes Kotlin more valuable is the management of null.
Kotlin help you to avoid the in-famous NPE (
NullPointerException). You have to understand that
you may have NPE, even with Kotlin, but this will happen if you don't make enough effort.
Kotlin will help you think about how you code in a good way.
In Kotlin a non-nullable string will be written
String and a nullable will be
Also, Kotlin provides a way to avoid NPE, when calling multiple level of nullable values.