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

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

typeof

never type

undefined type

void type

2. 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

3. What is TypeScript's 'async/await' feature used for?

To define a class

To create a loop

To work with asynchronous operations and promises

To print output

4. What is the purpose of namespaces in TypeScript?

To bundle related interfaces and classes

To create a new module

To define a new scope for variables

To import external libraries

5. Which of the following is a valid way to define a string variable in TypeScript?

string name = 'John';

let name: string = 'John';

const name = 'John';

name = 'John';

6. What does the 'as' keyword do in TypeScript?

Type casting

Variable declaration

Function invocation

Type checking

7. 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

8. 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

9. In TypeScript, what is the difference between 'interface' and 'type' when defining a new type?

Interfaces are only for objects, while types can be used for primitives too

Types can be used for unions and intersections, interfaces cannot

Interfaces can be merged, but types cannot

All of the above

10. What is TypeScript's 'type inference'?

A feature that allows automatic conversion of data types

A feature that infers the type of a variable based on its value

A feature that enforces strict typing

A feature that defines custom data types

TypeScript MCQ Test 5