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 1348

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

1 1476

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 1901

Event handler Example

1 1235

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

1 1583

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

1 1517

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

1 1352

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

1 1211

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

1 1292

What is the difference between synchronous and asynchronous JavaScrip

1 1387

What is the event loop in JavaScript?

1 1355

What is a Promise in JavaScript?

1 1342

What is this in JavaScript?

1 1304

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

1 1262

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Un-Answered Questions { JavaScript }

What is javascript and how it works?

956

How to add a new property in existing function javascript?

959

What are classes in javascript?

972

How do you declare javascript?

961

How do I run javascript on my iphone?

968

Which type of variable among global and local, takes precedence over other if names are same?

972

When would you use var in your declaration and when you wouldn’t?

919

How to access the value of a textbox using javascript?

1020

What is difference between local and global scope in javascript ?

1018

What is servlet in javascript?

943

Why extending array is bad idea?

1022

How do I turn on javascript in google chrome?

981

What are the main functions performed by javascript statements?

1041

What is the use of let & const in javascript?

944

What is scope of variable in javascript?

993

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