JavaScript Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

JavaScript Interview Questions

Questions Answers Views Company eMail

Difference Between JavaScript and ECMAScript?

906

How to prevent modification of an object in Javascript?

1173

How would you compare two objects in JavaScript?

960

What is differential inheritance?

953

How to load another html page from javascript?

954

Javascript, Pass by Value or Pass by Reference?

983

Difference between window, document, and screen in Javascript?

1110

What is Date object in JavaScript?

1104

Why extending array is bad idea?

1033

What is the difference between .call() and .apply()?

1029

What are the primitive data types in JavaScript?

1039

Entire content of a JavaScript source file in a function block?

1075

How to detect the OS on the client machine in JavaScript?

1110

What is the use of blur function in JavaScript?

1041

How do you submit a form using JavaScript?

937

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Un-Answered Questions { JavaScript }

Is client side front end?

879

Which built-in method returns the calling string value converted to lower case?

1171

How do I open a .js file?

886

What are the main uses of javascript?

1016

What is the difference between undefined value and null value?

1018

How do I run code in browser console?

1006

What is whitespace in javascript?

1004

Whether JavaScript has concept level scope?

1068

What are 2 (shorthand) boolean operators supported by javascript

975

In Javascript are calculations with fractional numbers guaranteed to be precise?

1072

Where are cookies actually stored on the hard disk?

944

Is javascript easier than java?

905

What is spread operator?

894

What does question mark mean in react?

860

What is namespacing in javascript and how is it used?

982

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