JavaScript Interview Question

There are many things that you can do ahead of time to prepare for the interviewing process, and move yourself a step above of the competition. Updating your resume and reviewing frequently asked interview questions can be very effective, and goes a long way in getting the most out of your interview.

To put a "close window" link on a page ?

<a href='javascript:window.close()' class='mainnav'> Close </a>

 

How to hide javascript code from old browsers that dont run it?

Use the below specified style of comments <script language=javascript> <!-- javascript code goes here // --> or Use the <NOSCRIPT>some html code </NOSCRIPT> tags and code the display html statements between these and this will appear on the page if the browser does not support javascript

 

How to comment javascript code?

Use // for line comments and
/*

*/ for block comments

 

Name the numeric constants representing max,min values

Number.MAX_VALUE
Number.MIN_VALUE

 

What does javascript null mean?

The null value is a unique value representing no value or no object.
It implies no object,or null string,no valid boolean value,no number and no array object.

 

How do you create a new object in JavaScript?

var obj = new Object(); or var obj = {};

 

How do you assign object properties?

obj["age"] = 17 or obj.age = 17.

 

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

arr[arr.length] = value;

 

What is this keyword?

It refers to the current object.