Tag: What does ~/ mean in Dart?

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 .

“!” 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.

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.