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Please note that the null coalescing operator allows for simple just to clarify a tricky point about the == comparison operator when dealing with strings and A common feature in many languages, the Null Coalescing Operator is a binary operator often used to shorten expressions of the type: where NCO is a placeholder for For example, if one wishes to implement some C# code to give a page a default title if none is present, one may use the following statement: This RFC proposes a unary version of ??, which would be equivalent to the normal binary version where the second argument is NULL. That is, $foo?? would now be valid The truth is, talk about this operator has been going on for a long time. Microsoft MVP - Azure. All opinions are my own & do not reflect that of my employer or other organizations I may be affiliated with. It turns out we can't; the above code does not compile. This is due to the fact that the Nullable<T> struct does not allow nullable types to be specified as its Null-Coalescing Operator Closely related to the conditional operator is the well-sounding null-coalescing operator, which was introduced in C# 2.0 as part of the Join Kevin Skoglund for an in-depth discussion in this video, Null coalescing operator, part of PHP 7 New Features. ERIC LIPPERT. These conversion rules considerably complicate the transformation of a null coalescing operator into an expression tree. In some cases, the compiler We could instead use a shortcut without side effect, the null coalescing operator ??. We could instead use a shortcut without side effect, the null coalescing operator ??. The Null Coalescing operator has been around since the early days of C#. Yet it still remains unused by most developers. I'm guessing this is because they are unaware The null coalescing operator (called the Logical Defined-Or operator in Perl ) is a binary operator that is part of the syntax for a basic conditional expression in 1) I imagine a non-nullable type is a type which doesn't allow uninitializing declarations, or in perl-lingo my $typevar wouldn't be allowed but my $typevar=init() would.