Object Types and Interfaces in TypeScript Quiz (original) (raw)

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

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.

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.

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.

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.

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.

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

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.

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

• Constructor implementations
• Global variable declarations

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.

There are 10 questions to complete.

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