TypeScript Quiz

This quiz will cover all the introductory level questions for typescript.

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Question 1

What is the primary purpose of TypeScript?

  • To replace JavaScript completely

  • To add static typing and enhance JavaScript features

  • To make JavaScript code run faster

  • To compile directly into machine code

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Question 2

How do you explicitly declare a variable with a type in TypeScript?

  • let name = "Alice"

  • let name: string = "Alice"

  • let string name = "Alice"

  • string name = "Alice"

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Question 3

. Which of the following is true about TypeScript?

  • TypeScript code runs directly in the browser

  • TypeScript must be compiled into JavaScript

  • TypeScript does not support JavaScript features

  • TypeScript cannot be used in frontend development

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Question 4

What command is used to install TypeScript globally using npm?

  • npm install typescript

  • npm install -g typescript

  • install -g typescript

  • npm typescript install

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Question 5

What is the file extension of TypeScript files?

  • .ts

  • .tsx

  • .js

  • Both a and b

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Question 6

How do you compile a TypeScript file named script.ts?

  • tsc script.ts

  • node script.ts

  • compile script.ts

  • typescript script.ts

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Question 7

Which of the following is NOT a valid TypeScript type?

  • number

  • boolean

  • character

  • unknown

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Question 8

What will be the output of the following TypeScript code?

TypeScript 
let x: any = "Hello";
x = 10;
console.log(typeof x);


  • "string"

  • "number"

  • "any"

  • "undefined"

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Question 9

Which TypeScript feature allows defining a custom structure for objects?

  • Classes

  • Interfaces

  • Functions

  • Enums

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Question 10

What does the readonly keyword do in TypeScript?

  • Prevents a variable from being modified after initialization

  • Makes a variable accessible only within a function

  • Prevents a variable from being used

  • Allows reassignment of a variable

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There are 10 questions to complete.

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