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 1475

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 1900

Event handler Example

1 1234

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

1 1579

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

1 1515

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

1 1350

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 1385

What is the event loop in JavaScript?

1 1352

What is a Promise in JavaScript?

1 1340

What is this in JavaScript?

1 1303

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

1 1262

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Un-Answered Questions { JavaScript }

What are the three core languages in web pages?

1037

Are Typescript and Javascript the same?

990

Difference between Pure functions Vs. Impure functions in javascript?

990

how to hide alphabets in java as password '*'

2116

What is the meaning of callback function?

1062

What is a nan value?

938

What is rest parameters in javascript?

1067

How do I open javascript console?

955

How do I use an external javascript file?

1007

What e means?

917

What is prototype in javascript and how do you use it?

939

What’s relationship between javascript and ecmascript?

1059

all possible test cases for normal number field,name field date field,check box,

1433

What is callback?

1166

How can you declare a class in javascript?

1145

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