Technical Interview Questions

Undefined value means the variable used in the code doesnt exist or is not assigned any value or the property doesnt exist.

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.

Number.MAX_VALUE
Number.MIN_VALUE

Use // for line comments and
/*
*/ for block comments

Use the below specified style of comments
script language=javascript
or Use the tags and code the display html statements between these and this will appear on the page if the browser does not support javascript

Breaking is possible within a string statement by using a backslash \ at the end but not within any other javascript statement.
that is ,
document.write(”Hello \world”);
is possible but not
document.write \
(”hello world”);

A prompt box allows the user to enter input by providing a text box.

An alert box displays only one button which is the OK button whereas the Confirm box displays two buttons namely OK and cancel.