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what means ?? in dart Code Example
what means ?? in dart 
// The ?? double question mark operator means "if null"
String a = b ?? 'hello'; // This means a equals b, but if b is null then a equals 'hello'. It is like || in JavaScript

b ??= 'hello'; // If b is null then set it equal to 'hello'. Otherwise, don't change it
Source: stackoverflow.com



Javascript

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