Null aware ternary operator

for example:

if(variable1 == null)
doSomthing();
else
doSomthingElse()

my suggestion for the syntax is as follows:
variable1?? doSomthing(): doSomthingElse();

I'm not entirely sure if this is already implemented.

No files, tests, or entry points are named. Start by checking the Dart language specification and current language status for existing null-aware conditional syntax; done would require a confirmed design decision and corresponding specification or implementation work.

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