Why is isNaN() is undefined?

Question

I'm new to this, so wondering if someone could please advise why isNaN() is undefined?

package nan;

public class nan {

    public static void main(String[] args) {
        
       {
           if (isNaN(1))
           {System.out.println("true");}
       
    };

    }
}

thanks

What host environment are you using? `System.out.println` is not native JavaScript. — Heretic Monkey, May 10 '21 at 21:31

score 1 · Answer 1 · answered May 10 '21 at 21:31

1

You want Double.isNaN or Float.isNaN in Java.

answered May 10 '21 at 21:31

iota

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Why is isNaN() is undefined?

1 Answers1