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.
Read moreWhat does a question mark after a variable mean?
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 .
Read moreWhat does two question marks together 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 double question mark mean in laravel?
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.
Read moreWhat is double question mark react?
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 .
Read moreHow do you use late keyword in darts?
Use the late keyword to initialize a variable when it is first read, rather than when it’s created . It’s common to use late in combination with final , to defer the creation of read-only variables to when they are first read.
Read moreHow do you check if a variable is null in darts?
Checking Nulls and Null-Aware Operators in Dart
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