JavaScript Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

JavaScript Interview Questions

Questions Answers Views Company eMail

How do you extend classes Code snippet: const circle = { radius: 20, diameter() { return this.radius * 2; }, perimeter: () => 2 * Math.PI * this.radius };

1 1362

Can you write a random integers function to print integers with in a range?

1 1489

What is the output of below code var car = new Vehicle("Honda", "white", "2010", "UK"); console.log(car); function Vehicle(model, color, year, country) { this.model = model; this.color = color; this.year = year; this.country = country; }

1 1914

Event handler Example

1 1241

What will be the output of the code below? var Y = 1; if (function F(){}) { y += Typeof F; } console.log(y);

1 1594

What will be the output of the following code? //nfe (named function expression) var Foo = Function Bar() { return 7; }; typeof Bar();

1 1530

What is a “closure” in JavaScript? Provide an example

1 1370

What is the difference between let, const, and var?

1 1223

Explain the difference between == and === in JavaScript.

1 1303

What is the difference between synchronous and asynchronous JavaScrip

1 1399

What is the event loop in JavaScript?

1 1373

What is a Promise in JavaScript?

1 1355

What is this in JavaScript?

1 1318

What is call(), apply(), and bind()?

1 1267

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Un-Answered Questions { JavaScript }

Program to return the address family of a socket

1351

Write a Program using Servlet and JDBC for developing online application for displaying the details of Cars owned by the residents in XYZ society. Make necessary assumptions and create appropriate databases

2311

What is the difference between undeclared & undefined?

929

How can a page be forced to load another page in javascript?

1109

What are ‘settimeout()’?

1110

How to get value from dropdown (select) control?

1059

What is the ‘Strict’ mode in JavaScript and how can it be enabled?

1017

What is javascript namespacing?

1057

How to get the contents of an input box using javascript?

1075

List few difference between java and javascript?

1004

What is the output of 10+20+”30″ in JavaScript?

1234

How to add new elements dynamically?

1018

How to create a cookie using javascript?

1097

How to detect the operating system on the client machine?

922

How to remove the event listener?

942

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