What is the use of null safety?

For us, in the context of null safety, that means that if an expression has a static type that does not permit null , then no possible execution of that expression can ever evaluate to null . The language provides this guarantee mostly through static checks, but there can be some runtime checks involved too.

Void safety (also known as null safety) is a guarantee within an object-oriented programming language that no object references will have null or void values . In object-oriented languages, access to objects is achieved through references (or, equivalently, pointers).

Flutter null safety is the feature that became available after the release of version 2 where the minimum version of Dart programming language is set to 2.12. This feature helps to improve developers’ productivity by eliminating a whole class of bugs caused by null dereferencing errors .23 Mar 2021