The question mark in JavaScript is commonly used as conditional operator — called ternary operator when used with a colon (:) and a question mark (?) — to assign a variable name conditionally .
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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.
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operator known as Null Coalescing Operator . It returns its first operand if it exists and is not NULL; otherwise, it returns its second operand. It evaluates from left to right.
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Conclusion. The JavaScript double question mark is also known as the nullish coalescing operator. It’s an operator that simply returns the right-side expression when the left side expression is either null or undefined .
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Dart offers some handy operators for dealing with values that might be null. One is the ??= assignment operator, which assigns a value to a variable only if that variable is currently null: int a; // The initial value of a is null.
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Declaring Variables In Dart Variables are declared using the var keyword followed by variable name that you want to declare . Dart is a type inferred language, which allows compiler automatically infer(know) the type of data we want to store based on the initial value we assign.
Read moreHow do you declare an integer variable in Dart?
Declaring Variables In Dart Variables are declared using the var keyword followed by variable name that you want to declare . Dart is a type inferred language, which allows compiler automatically infer(know) the type of data we want to store based on the initial value we assign.
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