Flutter for Beginners

Factory constructors

Another useful syntax in Dart is the factory constructor, which helps to apply the factory pattern, a creation technique that allows classes to be instantiated without specifying the exact resulting object type. Suppose we have the following descendants of the Person class:

class Student extends Person {  Student(firstName, lastName): super(firstName, lastName);}class Employee extends Person {  Employee(firstName, lastName): super(firstName, lastName);}

As you can observe, the descendant classes are still almost the same as the Person class, as they do not yet add any specific functionalities.

We can define a factory constructor on the Person class to instantiate the corresponding class based on the required type argument: ...