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 1299

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

1 1413

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 1520

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

1 1439

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

1 1281

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

1 1162

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

1 1247

What is the difference between synchronous and asynchronous JavaScrip

1 1318

What is the event loop in JavaScript?

1 1292

What is a Promise in JavaScript?

1 1257

What is this in JavaScript?

1 1239

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

1 1212

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Un-Answered Questions { JavaScript }

What can I build with javascript?

920

What is spread operator?

837

How to shift and unshift using javascript?

910

Which built-in method returns the string representation of the number’s value?

1098

Is javascript pure object oriented?

821

Why do we need javascript?

905

How to get the last index of a string in javascript?

919

a code in vb script, which creates a table of 5*2 in html this is a static table, one more same dynamic table, as we give input the table should get created.

1523

List some design patterns in javascript?

825

What is the use of a weakmap object in javascript?

906

What is the difference between innerhtml & innertext?

841

Auto insurance project..How to explain project in interviews.Using Automation tool (selenium).

1820

How to associate functions with objects using javascript?

981

What is a function constructor?

859

How can we establish connection with java and sql server?

2122

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