Prototypes Explained

This video tutorial explains JavaScript prototypes, a concept often confusing for beginners. It covers how objects inherit properties and methods from their prototypes, the prototype chain, and how to use constructors to create objects. The tutorial demonstrates adding methods to prototypes, such as calculateAge and getFullName, and explains the benefits of this approach. It also shows how to manipulate data using prototype methods and access object prototype methods like hasOwnProperty. The tutorial aims to simplify the understanding of prototypes and their practical applications in JavaScript.

What is a key difference between JavaScript and languages like Java or C in terms of object creation?

• JavaScript uses only primitive data types.

• JavaScript does not support object creation.

• JavaScript uses prototype-based objects.

• JavaScript uses class-based objects.

What is the prototype chain in JavaScript?

• A list of all variables in a JavaScript program.

• A hierarchy of objects from which properties and methods are inherited.

• A chain of events triggered by user actions.

• A sequence of functions that are executed in order.

Why should methods like 'calculateAge' be moved to the prototype?

• To make the code more readable.

• To allow each instance to have its own copy of the method.

• To save memory by sharing the method across instances.

• To prevent the method from being used.

What is the purpose of the 'getFullName' method in the prototype?

• To delete the first name of a person.

• To change the last name of a person.

• To return the full name of a person.

• To calculate the age of a person.

How does the 'getsMarried' method affect an object?

• It creates a new object.

• It deletes the object.

• It changes the last name of the object.

• It changes the first name of the object.

What does the 'hasOwnProperty' method check for?

• If a property is a string.

• If a property is a method.

• If a property is an own property of the object.

• If a property is part of the prototype.

Which of the following is NOT a method that can be added to a prototype?

• deleteObject

• getFullName

• calculateAge

• getsMarried