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 is a language that combines many of the best features of C#, Java, Python, and JavaScript , such as dynamic and static typing, async support, and lambda functions.
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Not necessarily . If you have used any Object Oriented Language such as Java, Python, PHP or C++, you will be able to work on Flutter even without prior knowledge of Dart. Understanding the basics of Dart will however be useful (and will be easy to learn if you already know OOP).
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