What does the isNaN() function?

[vidushi-tomar-7f335103 (Vidushi Tomar)]

What does the isNaN() function?

[manish-mandal-6876664d (Manish Mandal)]

isNan() function checks if the given value is NaN(Not A Number), If the given value is NaN it returns true.
Example:-
if( isNaN(variable) ) {
//code to be executed if it’s true
} else {
//code to be executed if it’s false
}