What is isNaN in javascript?

Posted by Rajni.Shekhar on 4/12/2012 | Category: JavaScript Interview questions | Views: 4467 | Points: 40

Answer:

isNaN is a function, it returns true if the argument is not a number.

Example:

var a="text";

var b=1234;

document.write(isNaN(a)) //it will return true

document.write(isNaN(b)) //returns false

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