Javascript - Introduction

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26. What is the purpose of the "Event Loop" in JavaScript?

To handle asynchronous operations and manage the execution stack

To define events for user interactions

To create loops for repetitive tasks

To connect JavaScript with external databases

Difficulty

2800

medium

27. Which browser introduced the concept of browser extensions and add-ons that utilize JavaScript?

Internet Explorer

Mozilla Firefox

Google Chrome

Safari

Difficulty

2900

medium

28. What is the significance of the "ESLint" tool in the JavaScript ecosystem?

It is a JavaScript framework for building web applications.

It is a testing library for JavaScript code.

It is a linter tool that helps enforce coding standards and identify common programming errors.

It is a JavaScript engine for server-side scripting.

Difficulty

3000

medium

29. How has the development and widespread use of JavaScript frameworks impacted web development practices?

They have made web development less interactive.

They have increased the need for server-side scripting.

They have led to more efficient and organized development by providing pre-built components.

They have eliminated the need for client-side scripting languages.

Difficulty

3000

medium

30. What is the purpose of the "npm" (Node Package Manager) in the JavaScript ecosystem?

To manage packages and dependencies in JavaScript projects

To execute JavaScript code on the server side

To create animations and effects in web development

To handle events in the DOM

Difficulty

3300

high

31. What is the role of the "document" object in JavaScript?

It represents the browser's document and provides methods to manipulate it.

It is used for mathematical calculations.

It is a built-in JavaScript function for error handling.

It refers to the global execution context.

Difficulty

3000

medium

32. Which version of JavaScript introduced the "class" keyword for defining classes?

ECMAScript 2015 (ES6)

ECMAScript 3

ECMAScript 2018 (ES9)

ECMAScript 5

Difficulty

3000

medium

33. What is the purpose of the "WebAssembly" standard in JavaScript?

To enhance web security

To enable cross-browser compatibility

To improve the performance of web applications by allowing code execution in a low-level, binary format

To create dynamic HTML elements

Difficulty

2800

medium

34. Which programming paradigm is JavaScript primarily associated with?

Procedural programming

Object-oriented programming

Functional programming

Imperative programming

Difficulty

2800

medium

35. Which type of JavaScript language is ___

Object-Oriented

Object-Based

Assembly-language

High-level

Difficulty

1800

low

36. In JavaScript, what is a block of statement?

Conditional block

block that combines a number of statements into a single compound statement

both conditional block and a single statement

block that contains a single statement

Difficulty

3200

high

37. Which of the following type of a variable is volatile?

Mutable variable

Dynamic variable

Volatile variable

Immutable variable

Difficulty

2800

medium

38. In the JavaScript, which one of the following is not considered as an error:

Syntax error

Missing of semicolons

Division by zero

Missing of Bracket

Difficulty

3400

high

39. Which of the following number object function returns the value of the number?

toString()

valueOf()

toLocaleString()

toPrecision()

Difficulty

2800

medium

40. In the following given line of code, the prototype representing the_____

functionx(){};

Function x

Prototype of a function

A custom constructor

Not valid

Difficulty

3000

medium

41. Which of the following statement is not correct in the case of JavaScript?

JavaScript is a light-weighted and interpreted language.

JavaScript is a high-level programming language.

JavaScript is a case-sensitive language.

JavaScript provides reasonable control to the users over the web browsers.

Difficulty

1800

low

42. Why is JavaScript called a structured programming language?

Because all popular web browsers support JavaScript as they provide built-in execution environments

Because it is an object-oriented programming language that uses prototypes rather than using classes for inheritance

Because it follows the syntax and structure of the C programming language, which is a structured programming language

Because it ignores spaces, tabs, and newlines that appear in JavaScript programs

Difficulty

2400

medium

43. Which of the following is not a JavaScript framework or library?

Polymer

Meteor

jQuery

Cassandra

Difficulty

1600

low

44. Why does the name of JavaScript and Java are similar?

JavaScript is a stripped-down version of Java.

The syntax of JavaScript is loosely based on the syntax of Java.

JavaScript and Java both are originated on the island of Java.

None of the above

Difficulty

1600

low

45. Which of the following is the correct statement of WHILE loop start?

while (i <= 10)

while (i <= 10; i++)

while i = 1 to 10

None of These

Difficulty

2400

medium

Ehsan Arvacheh

1026 points

Ovi Baidya

1019 points

Introduction

Want to challenge your knowledge?

Question Bank

26. What is the purpose of the "Event Loop" in JavaScript?

27. Which browser introduced the concept of browser extensions and add-ons that utilize JavaScript?

28. What is the significance of the "ESLint" tool in the JavaScript ecosystem?

29. How has the development and widespread use of JavaScript frameworks impacted web development practices?

30. What is the purpose of the "npm" (Node Package Manager) in the JavaScript ecosystem?

31. What is the role of the "document" object in JavaScript?

32. Which version of JavaScript introduced the "class" keyword for defining classes?

33. What is the purpose of the "WebAssembly" standard in JavaScript?

34. Which programming paradigm is JavaScript primarily associated with?

35. Which type of JavaScript language is ___

36. In JavaScript, what is a block of statement?

37. Which of the following type of a variable is volatile?

38. In the JavaScript, which one of the following is not considered as an error:

39. Which of the following number object function returns the value of the number?

40. In the following given line of code, the prototype representing the_____

41. Which of the following statement is not correct in the case of JavaScript?

42. Why is JavaScript called a structured programming language?

43. Which of the following is not a JavaScript framework or library?

44. Why does the name of JavaScript and Java are similar?

45. Which of the following is the correct statement of WHILE loop start?

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