FLUTTER Constructors in Dart

Constructors are a special method that is used to initialize an object when created in the program. In object-oriented programming when an object is created, it automatically calls the constructor. All classes have their default constructor which is created by the compiler when class is called, moreover one can also define constructor of its own. But, you must note that if you do so than the default constructor will not be created and will be ignored.
To allow classes to have multiple constructors, Dart supports named constructors. Dart supports factory constructors, which can return subtypes or even null. Sometimes a constructor’s only purpose is to redirect to another constructor in the same class. If your class produces objects that never change, you can make these objects compile-time constants.

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