Overriding methods and properties in Swift - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does it mean to override a method in Swift?

Overriding a method means providing a new version of a method in a subclass that replaces the version defined in its superclass.

beginner

How do you indicate that a method or property is being overridden in Swift?

You use the override keyword before the method or property declaration in the subclass.

intermediate

Can you override a property in Swift? If yes, what kinds of properties can be overridden?

Yes, you can override computed properties and property observers, but not stored properties directly.

beginner

What happens if you try to override a method without using the override keyword?

Swift will give a compile-time error because it requires explicit use of override to avoid accidental overrides.

intermediate

Explain how to call the superclass version of an overridden method in Swift.

Inside the overriding method, you call super.methodName() to run the original method from the superclass.

Which keyword is required to override a method in Swift?

A override

B super

C extends

D func

The override keyword tells Swift you are replacing a method or property from the superclass.

What will happen if you override a method but forget to write the override keyword?

A Swift gives a compile-time error

B The program runs normally

C The superclass method is called instead

D The method is ignored

Swift requires the override keyword to prevent accidental overrides, so it gives an error if missing.

How do you call the original method from the superclass inside an overridden method?

A parent.methodName()

B self.methodName()

C super.methodName()

D base.methodName()

Using super.methodName() calls the superclass version of the method.

Which of these can be overridden in Swift?

A Stored properties

B Local variables

C Constants

D Computed properties

You can override computed properties and property observers, but not stored properties directly.

Why is overriding useful in programming?

A To reuse code without changes

B To change or extend behavior of inherited methods

C To create new classes

D To delete superclass methods

Overriding lets subclasses change or add to the behavior of methods they inherit.

Describe how to override a method in Swift and how to call the original method from the superclass.

Think about the keywords and syntax needed to replace and extend a method.

Explain what kinds of properties can be overridden in Swift and why stored properties are treated differently.

Consider how properties store or calculate values.