Null Safety
Explore Kotlin's approach to null safety by learning how nullability is built into variable types. Understand the use of the safe call operator and Elvis operator to write robust code that prevents NullPointerExceptions. Gain practical knowledge of how Kotlin enforces null safety at compile time and simplifies handling nullable values.
We'll cover the following...
Overview
In Kotlin, the nullability of a variable is an integral part of its type. Fortunately, it is quickly determined with a simple ?.
The infamous NullPointerException is probably the most common error message that Java programs produce at runtime. It is no coincidence that Tony Hoare, the inventor of the zero references, describes it as his trillion-dollar mistake.
In Java, annotations like @NotNull only slightly improve the control over the nullability of references. In Kotlin, however, they are an integral part. There are real keywords ...