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 moreHow do you write a fat arrow?
An arrow function expression is an anonymous function expression written with the “fat arrow” syntax ( => ) . Like traditional function expressions, arrow functions are not hoisted, and so you cannot call them before you declare them. They are also always anonymous—there is no way to name an arrow function.
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 does T stand for in Dart?
DART stands for “days away, restricted or transferred .” DART is a safety metric mandated by OSHA.
Read moreWhat is a fat arrow syntax in Dart?
Fat Arrow Expression or Lambda Function Expression is a syntax to write a function on a single line using => syntax AKA fat arrow . This resembles the ES6 Fat Arrow function syntax of JavaScript. This is a cleaner way to write functions with a single statement.6 Eki 2019
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