TypeScript Object Oriented Programming Quiz (original) (raw)

Which of the following defines a property in a class in TypeScript?

Which access modifier allows a property to be accessed only within the class in which it is defined?

What happens if you try to modify a property marked as readonly?

• It throws a runtime error.
• It throws a compile-time error.
• It logs a warning to the console.
• It silently ignores the change.

What is the purpose of a setter in a class?

• To define a method that performs an action
• To retrieve the value of a private property.
• To set or modify the value of a private property.
• To call a constructor with parameters.

Which of the following is a correct example of a getter method in TypeScript?

• getProperty { return this.property; }
• get getProperty() { return this.property; }
• getter getProperty() { return this.property; }
• function getProperty() { return this.property; }

What is the key characteristic of an abstract class?

• It cannot have any methods.
• It can be instantiated directly.
• It can have both abstract and non-abstract methods.
• It must have only abstract methods.

How is an abstract method declared in TypeScript?

• abstract myMethod(): void;
• function abstract myMethod() {}

What happens if a class does not implement all properties of an interface it claims to implement?

• It compiles but logs a warning.
• It throws a runtime error.
• It silently ignores the missing properties.

How do you declare that a class implements multiple interfaces?

• class MyClass extends Interface1, Interface2 {}
• class MyClass implements Interface1, Interface2 {}
• class MyClass inherits Interface1, Interface2 {}
• class MyClass extends Interface1 implements Interface2 {}

Which of the following is a valid implementation of an interface in a class?

TypeScript ``

interface Vehicle { speed: number; move(): void; }

class Car implements Vehicle { speed: number; move() { console.log(The car is moving at ${this.speed} km/h); } }

``

• The class Car correctly implements Vehicle.
• The class Car is missing the speed property.
• The class Car is missing the move method.
• The move method in Car has the wrong return type.

There are 10 questions to complete.

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