Excellent Typescript Test - 87+ MCQs: TypeScript test: Evaluate Your Programming Skills with TypeScript Questions and Answers

1. What is the purpose of TypeScript's 'null' and 'undefined' types?

To represent the absence of a value

To define a class

To create a loop

To print output

2. What is the TypeScript equivalent of 'console.log()' in JavaScript?

print()

log()

console.log()

display()

3. What is the use of the 'declare' keyword in TypeScript?

To define a new variable

To declare the type of a variable without initializing it

To declare a dependency

To declare a new function

4. What is the TypeScript equivalent of 'undefined' in JavaScript?

null

undefined

void

nil

5. What is the purpose of TypeScript's 'readonly' modifier?

To define a class

To create a loop

To make a property or variable immutable

To print output

6. What is a discriminated union in TypeScript?

A union type that includes discriminant properties

A union type that excludes certain types

A special type of intersection type

A union type that is discriminated by the compiler

7. What is the purpose of the 'extends' keyword in TypeScript?

To create a new class

To declare a variable

To extend the functionality of a class

To define a function

8. What is the purpose of the 'interface' keyword in TypeScript?

To define a new class

To declare a function

To create a contract for object structure

To import external libraries

9. Which TypeScript feature is used to create a new type that is composed of existing types?

Type casting

Type assertion

Union type

Intersection type

10. Which TypeScript feature is used to apply metadata to classes, methods, or properties?

Access modifier

Type assertion

Decorator

Mixin

11. What TypeScript feature allows for specifying an exact set of string values for a type?

Enum

Literal Types

Union Types

Type Aliases

12. In TypeScript, what is the purpose of the 'namespace' keyword?

To define a class

To create a loop

To group related code into a named container

To print output

13. What is the purpose of TypeScript's 'as' keyword?

To compare two values

To cast or convert types

To define a variable

To create a class

14. How do you define a function in TypeScript?

function functionName() {}

const functionName = () => {}

def functionName() {}

method functionName() {}

15. In TypeScript, what is the 'any' type used for?

To define a class

To create a loop

To represent a variable with an unknown or dynamic type

To print output

16. What is TypeScript's 'module' system used for?

To define a class

To create a loop

To organize and encapsulate code into reusable units

To print output

17. Which of the following allows TypeScript to infer the return type of a function?

Type Inference

Explicit Typing

Type Assertion

Dynamic Typing

18. What is the purpose of TypeScript's 'class' keyword?

To declare a new function

To create an instance of a class

To define a new data type

To define a blueprint for creating objects

19. What is TypeScript's 'namespace' used for?

To create a new file

To group related code

To define a class

To declare a variable

20. What is the TypeScript feature used to combine multiple types into a single type?

Type casting

Type assertion

Union type

Intersection type

TypeScript MCQ Test 4