The double question mark operator is called the nullish coalescing operator, and it’s a new feature of JavaScript ES2020 that allows you provide a default value to use when a variable expression evaluates to null or undefined .
Read moreWhat does exclamation point mean darts?
“!” is a new dart operator for conversion from a nullable to a non-nullable type . Read here and here about sound null safety. Use it only if you are absolutely sure that the value will never be null and do not confuse it with the conditional property access operator. Follow this answer to receive notifications.
Read moreHow do you check null in darts?
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 a double question mark mean?
If double question marks are uses it is to emphasise something in return, usually from the shock of the previous thing said . For example, if I said: ‘My dog just died’ (sad, but used for example…) Someone may reply.
Read moreWhat is the use of operator in flutter?
An operator is a special symbol that is used to carry out some specific operation on its operand . In Dart, we have a rich set of built-in operators to carry out the different types of operations. There are operators for assignment, arithmetic operations, logical operations, and comparison operations, etc.
Read moreHow do you use and operators?
This operator performs logical conjunction on two Boolean expressions. If both expressions evaluate to True, the AND operator returns True. If either or both expressions evaluate to False, the AND operator returns False .
Read moreHow do you use if else?
Conditional Statements
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