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

JavaScript Interview Questions

Questions Answers Views Company eMail

What are self Executing Functions?

1177

Is Javascript a Functional Programming Language?

1138

Difference between the substr() and substring() in JavaScript?

1062

Which keyword is used to print the text in the screen?

1051

What is Browser Object Model?

971

Basic methods for opening a popup window using javascript?

983

what data type javascript supports?

995

How will you create new object in javascript?

1063

How to create a confirmation box?

936

How to toggle display an html element?

1069

What’s a way to append a value to an array?

1033

How do you check if a variable is an object

1208

When would you use var in your declaration and when you wouldn’t?

925

What is variable typing in javascript?

1066

What’s relationship between javascript and ecmascript?

1078

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Un-Answered Questions { JavaScript }

Is webassembly faster than javascript?

954

Why do we use javascript?

920

Explain the difference between javascript and an asp script.

1114

What is output of “20” + 20? In javascript?

958

What is the use of Void(0)?

1067

How do you sort in javascript?

1038

How do you define a class and its constructor?

975

What can I build with javascript?

965

Explain escape() in javascript?

907

What is new function in javascript?

1037

What is the difference between sessionstate and viewstate?

939

How to call a function inside a function in javascript?

948

How will you explain closures in javascript? When are they used?

996

Explain typecasting in javascript?

909

Explain the working of timers in JavaScript? Also elucidate the drawbacks of using the timer, if any?

998

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