Object Types and Interfaces in TypeScript Quiz

This quiz explores object types and interfaces in TypeScript, covering object type definitions, interfaces, type aliases, and their differences.

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Question 1

What is the primary purpose of defining object types in TypeScript?

  • To ensure proper data encapsulation

  • To specify the structure and shape of objects

  • To enforce access modifiers

  • To dynamically change an object's properties

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Question 2

Which of the following best describes object types in TypeScript?

  • They define the behavior of a class.

  • They enforce the structure of an object.

  • They allow dynamic type creation at runtime.

  • They enable asynchronous operations on objects.

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Question 3

What feature is specific to interfaces in TypeScript?

  • The ability to define unions of types.

  • The ability to extend other interfaces.

  • The ability to define dynamic property keys.

  • The ability to create conditional types.

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Question 4

Which of the following is a key benefit of type aliases in TypeScript?

  • They are faster to compile than interfaces.

  • They can define unions and intersections.

  • They cannot be reassigned once declared.

  • They enforce stricter type checking than interfaces.

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Question 5

What is a primary advantage of using interfaces over type aliases?

  • They allow merging of declarations.

  • They provide better runtime performance.

  • They are easier to convert to JavaScript.

  • They allow defining callback functions.

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Question 6

Which of the following situations is best suited for type aliases?

  • Defining object shapes with optional properties.

  • Representing a union type like number | string

  • Extending a reusable object structure.

  • Defining an interface for a class implementation.

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Question 7

What is the recommended approach when you need to define a reusable object shape that might need extension in the future?

  • Use a type alias.

  • Use an interface.

  • Use any type.

  • Use a class.

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Question 8

What happens if an object does not conform to the defined object type in TypeScript?

  • The object will still compile but may cause runtime errors.

  • The TypeScript compiler throws an error.

  • The object is automatically adjusted to fit the type.

  • The object type is ignored entirely.

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Question 9

Which of the following can be included in a TypeScript interface?

  • Properties and methods

  • Constructor implementations

  • Default property values

  • Global variable declarations

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Question 10

Why might you prefer a type alias over an interface for certain definitions?

  • Type aliases allow merging declarations.

  • Type aliases can represent union and intersection types.

  • Type aliases are faster to compile than interfaces.

  • Type aliases enforce stricter type safety.

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