TypeScript for Beginners - Introduction - Polymorphism

The video tutorial explains polymorphism in object-oriented programming (OOP). It describes how a parent class variable can hold objects of its child classes, such as student, employee, and trainer. Each child class has a unique work method, and invoking the work method through the parent class variable calls the appropriate method based on the object type. This demonstrates polymorphism, where the same reference can point to different child class instances and invoke specific behaviors.

What does the term 'poly' signify in the context of polymorphism?

• Shape

• Form

• Single

• Multiple

Which of the following is NOT a child class of 'Person' as mentioned in the video?

• Student

• Trainer

• Employee

• Manager

What can a 'Person' type variable hold?

• Only 'Person' objects

• Objects of any class

• Instances of its child classes

• Only 'Student' objects

How does polymorphism determine which 'work' method to invoke?

• By the name of the method

• By the type of the object reference

• By the size of the object

• By the order of method declaration

What is the main advantage of using polymorphism in programming?

• It simplifies memory management

• It reduces the need for classes

• It enables a single interface to represent different underlying forms

• It allows for faster execution