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 1364

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

1 1490

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 1245

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 1531

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

1 1373

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 1401

What is the event loop in JavaScript?

1 1373

What is a Promise in JavaScript?

1 1356

What is this in JavaScript?

1 1319

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

1 1270

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Un-Answered Questions { JavaScript }

What is enum data type?

945

What are the Non-primitive data types in JavaScript?

1003

What are the decodeURI() and encodeURI()?

1053

How to define a named function in JavScript?

992

how can we retrieve value from one database server and store them another database server using sql server code

2120

Explain promise in javascript?

864

What is dataview in javascript?

950

Which software is used for javascript?

933

How to convert a string to lowercase?

1170

What are the problems associated with using javascript, and are there javascript techniques that you discourage?

1245

what data type javascript supports?

995

hello sir my name is naga sekhar i completed my b-tech in 2011 with 61% in IT streme.I completed my core and advanced java coure before 8months back.Still i did not get the job.i tried so many times.and i went to some interviews but no use.now i want to get the job in software sector

2344

how can i change colour of a image in aspx file?

1994

What is null in programming?

1130

coding of java scripts

1960

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