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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