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 1298

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

1 1411

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 1842

Event handler Example

1 1187

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

1 1519

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

1 1435

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

1 1280

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

1 1160

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

1 1245

What is the difference between synchronous and asynchronous JavaScrip

1 1317

What is the event loop in JavaScript?

1 1289

What is a Promise in JavaScript?

1 1255

What is this in JavaScript?

1 1238

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

1 1211

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Un-Answered Questions { JavaScript }

How to remove duplicate values from a javascript array?

939

Explain arrow functions?

906

If you need to hide the javascript code from the older browser versions, how will you perform it?

931

What are limitations in javascript?

902

What is javascript ‘strict mode’?

897

Can I declare a variable as CONSTANT in JavaScript?

937

Is javascript backend or frontend?

848

What is array constructor in javascript?

979

What is javascript? List some data types supported by javascript?

939

How to define a named function in JavScript?

945

How to manage exception handling in javascript?

945

What does polyfill mean?

849

How can you declare a class in javascript?

1080

What is the difference between textContent and innerText?

952

Write a program in Java to display the IP address of the local and remote machine.

2146

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