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ES6 - Number.NaN
Unquoted literal constant NaN is a special value representing Not-a-Number. Since NaN always compares unequal to any number, including NaN, it is usually used to indicate an error condition for a function that should return a valid number.
Syntax
var val = Number.NaN;
Example
var dayOfMonth = 50; if (dayOfMonth < 1 || dayOfMonth > 31) { dayOfMonth = Number.NaN console.log("Day of Month must be between 1 and 31.") } else { console.log("day of month "+dayOfMonth) }
The following output is displayed on successful execution of the above code.
Day of Month must be between 1 and 31.
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