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JavaScript Interview Questions
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How do you extend classes Code snippet: const circle = { radius: 20, diameter() { return this.radius * 2; }, perimeter: () => 2 * Math.PI * this.radius };

 1 1014

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

 1 1112

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 1506

Event handler Example

 1 894

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

 1 1237

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

 1 1166

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

 1 996

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

 1 264

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

 1 209

What is the difference between synchronous and asynchronous JavaScrip

 1 264

What is the event loop in JavaScript?

 1 269

What is a Promise in JavaScript?

 1 252

What is this in JavaScript?

 1 226

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

 1 247

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Un-Answered Questions { JavaScript }

What is scope chain in javascript?

705

What is local and global scope?

712

Name the numeric constants representing max, min values?

772

Can webassembly replace javascript?

703

Explain how can you submit a form using JavaScript?

675

What will happen if an infinite while loop is run in Javascript?

714

Explain the term closure?

787

How to access the value of a textbox using javascript?

721

What is npm repository?

651

Name the different types of pop up boxes in Javascript?

751

How to determine the state of a checkbox using javascript?

831

When would you use javascript closures?

655

Which is better python or javascript?

687

Who introduced javascript?

710

What is a named function in JavaScript? How to define a named function?

730

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