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 the question mark mean in flutter?
This is with null safety, the question mark means that this String? can possibly be null and flutter will allow you to assign null to it . String can never be null and you’ll get an error before compiling.29 Mar 2021
Read moreHow do you use if else?
Conditional Statements
Read moreHow do you add an if else condition in flutter?
Ways to Use If Else Statement in Flutter Widget
Read moreHow do you use a conditional statement within a child attribute of a flutter widget?
How to use Conditional Statement (IF ELSE) on Child Widget in…
Read moreWhat is ternary operator in Dart?
The conditional (ternary) operator is the only Dart operator that takes three operands : a condition followed by a question mark (?), then an expression to execute if the condition is truthy followed by a colon (:), and finally the expression to execute if the condition is falsy.8 Mar 2022
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