What does <> mean in Dart?

The Dart language now supports sound null safety ! When you opt into null safety, types in your code are non-nullable by default, meaning that variables can’t contain null unless you say they can. With null safety, your runtime null-dereference errors turn into edit-time analysis errors.

String interpolation is the process of inserting variable values into placeholders in a string literal . To concatenate strings in Dart, we can utilize string interpolation. We use the ${} symbol to implement string interpolation in your code.

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”.