Use of indexOf() Method in JavaScript

var araj=["1","2"];  
var idx=Array.IndexOf(araj,"1");

Doesn't work as expected. Why, and what's next?

EDIT: it is javascript in asp.net (so the friend who won't open account here says)

indexOf has a lowercase i

Javascript is case sensitive language. IndexOf should be indexOf:

var araj=["1","2"];  
var idx=Array.indexOf(araj,"1");

Result:

0

More Info:

http://www.tutorialspoint.com/javascript/array_indexof.htm

Change IndexOf to indexOf.

Javascript is case-sensitive.

Although equivalent, I prefer this method.

var araj = ['1', '2'];
var idx = araj.indexOf('1');
alert(idx);