What does isNaN function behave in Javascript?

 Posted by vishalneeraj-24503 on 12/10/2013 | Category: JavaScript Interview questions | Views: 1239 | Points: 40
Answer:

It's a javascript in-built function which returns true,if expression or argument is not a number otherwise returns false.
Full form of isNan is Not a number.

For Example:-

document.write(isNaN("Vishal")+ "</br>");

document.write(isNaN("2013/12/10")+ "</br>");
document.write(isNaN(123)+ "</br>");

Output will be:-

true
true
false


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