during check varibale is number or not
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When you use isNaN function in JavaScript?
3 Answers
Bidyasagar MishraPosted Jul 17, 2019, 7:56 AM
The isNaN() function decides whether a value is an illegal number(Not-a-Number).
Return Value
true if the value converted to the Number type is the NaN, otherwise false.
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eswariPosted Dec 10, 2012, 12:10 AM
isNaN() function determines the value which is passed to the function is a non-numeric or not. If the value is numeric it returns false else it returns true.
ex:
document.write(isNaN(123)); false
document.write(isNaN(-1.23)); false
document.write(isNaN('hello')); true
R ACHUTHAPosted Aug 27, 2012, 5:56 AM