double question mark operator means “if null “.
Read moreWHAT IS null check operator in Dart?
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.
Read moreWhat is null safety in flutter?
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.
Read moreWHAT IS null check operator in Dart?
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.
Read moreWhat does after a variable mean in Dart?
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”.
Read moreWhat does <> mean in Dart?
This are generic type parameters. It allows specializations of classes. List is a list that can contain any value (if no type parameter is passed dynamic is used by default). List<int> is a list that only allows integer values and null `. You can add such Type parameters to your custom classes as well.
Read moreWhat are the operators?
In mathematics and sometimes in computer programming, an operator is a character that represents an action , as for example x is an arithmetic operator that represents multiplication. In computer programs, one of the most familiar sets of operators, the Boolean operators, is used to work with true/false values.
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