What is string interpolation in Dart?

Null Safety in simple words means a variable cannot contain a ‘null’ value unless you initialized with null to that variable . With null safety, all the runtime null-dereference errors will now be shown in compile time.

Null-aware operators are used in almost every programming language to check whether the given variable value is Null . The keyword for Null in the programming language Dart is null. Null means a variable which has no values assign ever and the variable is initialized with nothing like.

Answer (1) A nullable type by adding a question mark (?) after the type name. For example, a variable _contacts? can contain a value, or it can be null. Answer (2) It is called “Null-aware operators”.