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?

903

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?

953

Javascript, Pass by Value or Pass by Reference?

981

Difference between window, document, and screen in Javascript?

1109

What is Date object in JavaScript?

1101

Why extending array is bad idea?

1032

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

1029

What are the primitive data types in JavaScript?

1038

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

1074

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?

935

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Un-Answered Questions { JavaScript }

What is the most popular javascript library?

917

What is the difference between == and ===? Which one would you use?

1076

Why extending array is bad idea?

1032

How to update a function in javascript?

1105

What is ‘this’ keyword in JavaScript?

992

What is local and global scope?

956

How to determine the state of a checkbox using javascript?

1215

How are DOM utilized in JavaScript?

1118

What is built in function in javascript?

1025

How do we get javascript onto a web page?

876

What is a null variable?

937

Is a relation always a function?

949

Is html and javascript the same?

879

What e means?

927

List few difference between primitive and non primitive javascript data types?

990

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