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

1. Which TypeScript feature allows you to work with a variable that could be of several different types?

Union Types

Intersection Types

Generic Types

Any Types

2. In TypeScript, what is the purpose of the 'as' keyword?

To define a class

To cast one type into another

To create a loop

To print output

3. How do you define a function in TypeScript?

function functionName() {}

const functionName = () => {}

def functionName() {}

method functionName() {}

4. Which TypeScript feature is used for ensuring code blocks are never reached?

typeof

never type

undefined type

void type

5. How do you declare a readonly array in TypeScript?

let readonlyArray: ReadonlyArray<number>

let readonlyArray: number[] readonly

readonly let readonlyArray: number[]

let readonlyArray: const number[]

6. What is TypeScript's 'generics' feature used for?

To create generic functions and classes that work with multiple data types

To generate random data

To define a class

To print output

7. What does the 'keyof' keyword do in TypeScript?

Returns the values of an object

Returns the keys of an object as a union type

Creates a new object

Checks the presence of a key in an object

8. What is TypeScript's 'tuple' data type used for?

To define a class

To create a loop

To represent an array with a fixed number of elements of different data types

To print output

9. 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

10. How do you define a class in TypeScript?

class MyClass {}

create class MyClass {}

new class MyClass {}

type MyClass {}

TypeScript MCQ Test 5