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I've seen this code can anyone please explain to me what the AppTheme._() means, as I've read about its singleton class in dart but I really can't understand how it works.
class AppTheme { AppTheme._(); static const Color notWhite = Color(0xFFEDF0F2); static const Color nearlyWhite = Color(0xFFFEFEFE); static const Color white = Color(0xFFFFFFFF); static const Color nearlyBlack = Color(0xFF213333); ... } 
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. _() is a named private constructor. If a class does not specify another constructor (either default or named) that is not private, that class cannot be instantiated from outside of the library.
_(); is a named constructor (another examples might be the copy constructor on some objects in the Flutter framework: ThemeData. copy(...); ). In dart, if the leading character is an underscore, then the function/constructor is private to the library.
A function is a top-level function which is declared outside of a class or an inline function that is created inside another function or inside method. A method is tied to an instance of a class and has an implicit reference to this .
AppTheme._(); is a named constructor (another examples might be the copy constructor on some objects in the Flutter framework: ThemeData.copy(...);).
In dart, if the leading character is an underscore, then the function/constructor is private to the library. That's also the case here, and the underscore is also the only character, so I'd imagine whoever wrote this constructor didn't plan for that constructor to ever be called at all.
The AppTheme._(); isn't necessary unless you don't want AppTheme to ever be accidentally instantiated using the implicit default constructor.
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