Summary

In this chapter, we have learned when and how to use creational design patterns. We started by discussing how to use the object keyword to construct a singleton class, and then we discussed the use of companion object if you need a Static Factory Method. We also covered how to assign multiple variables at once using destructuring declarations.

Then, we discussed smart casts, and how they can be applied in the Abstract Factory design pattern to create families of objects. We then moved to the Builder design pattern and learned that functions can have default parameter values. We then learned that we can refer to their arguments using not only positions but also names.

Finally, we covered the copy() function of the data classes, and how it helps us when implementing the Prototype design pattern to produce similar objects with slight changes. You should now understand how to use creational design patterns to better manage your objects.

In the next chapter, we'll...