When would you use a factory constructor flutter?

A factory constructor is a constructor that can be used when you don’t necessarily want a constructor to create a new instance of your class . This might be useful if you hold instances of your class in memory and don’t want to create a new one each time (or if the operation of creating an instance is costly).

In Factory pattern, we create object without exposing the creation logic to the client and refer to newly created object using a common interface.

Factory method is a creational design pattern which solves the problem of creating product objects without specifying their concrete classes . Factory Method defines a method, which should be used for creating objects instead of direct constructor call ( new operator).

A factory constructor invokes another constructor . Since a factory constructor does not directly create a new instance, it cannot use a constructor initializer list. A normal constructor always returns a new instance of the class.