Declaration of variables that support null-value (nullable-variables). This is a significant advantage of the Kotlin language. That is, the error can be immediately identified and corrected, otherwise the program code will not be compiled. In the Kotlin language, the type system is organized in such a way that errors using nullable types are already detected at compile time. As a consequence, an exception is thrown (in Java it is a ), which is a consequence of the fact that the compiler was unable to detect an error during the compilation of the program. In other programming languages (Java in particular), incorrect use of nullable elements leads to run-time errors, which is very undesirable. When writing programs, it is important to use nullable elements correctly to avoid errors. non-nullable – elements that cannot take a null value.
nullable are elements that can take a null value.Based on this context, Kotlin language elements are divided into two types: In the Kotlin language, null means that there is no value for variables declared as val or var at the moment. The terms null-value and zero-value are different things.
In modern programming languages (including Java, C#, etc.) there are situations when a value does not contain any value.
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