ParseInt of non numeric value does not equal NaN?

Asked Mar 11 '23 at 11:21

Active Mar 11 '23 at 11:21

Viewed 24 times

I am trying to implement some javascript in my website but have gotten a problem when checking if a user input is a number. For example when passing "r" into parseInt() or parseFloat() the result in the console is NaN as expected. But when comparing NaN and ParseInt("r") the result is false (they are not the same) when I would've expected the comparison to return true

code and console output

console.log(parseInt("r"), parseInt("r") === NaN)

NaN false

console.log(parseFloat("r"), parseFloat("r") === NaN)

NaN false

asked Mar 11 '23 at 11:21

logan_9997

1

use `isNaN` function – cmgchess Mar 11 '23 at 11:23
NaN equals nothing. Not even itself. `NaN === NaN` is false **by definition**. – slebetman Mar 11 '23 at 11:30
`Object.is(parseFloat("r"), NaN)` – Yousaf Mar 11 '23 at 11:37

ParseInt of non numeric value does not equal NaN?

0 Answers0