Math operations with normal numbers, such as 0/0 and Math.sqrt(-1), can also produce NaN.
According to the ECMA-262 spec, NaN is a Number, despite its name meaning "Not a Number": "4.3.20 Number Type The type Number is a set of values representing numbers. In ECMAScript, the set of values represents the double-precision 64-bit format IEEE 754 values including the special "Not-a-Number" (NaN) values, positive infinity, and negative infinity." The concept of NaN dates back at least to the IEEE 754 specification for binary floating-point arithmetic. - Gordon -----Original Message----- From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] Sent: Tuesday, April 19, 2005 4:09 AM To: flexcoders@yahoogroups.com Subject: RE: [flexcoders] Simple arithmetic - resolved > Question - shouldn't this have thrown an error, since I was casting the > non-number variable as a number in the parameter statement, as > varX:Number? Flash is not checking types runtime, only compile time. And compile time everything is programmed right >trace(!isNaN(NaN)); NaN is kind of its own type and is usually the result of an equation with a string or some other non-numeric type. Greetz Erik -----Original Message----- From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of JesterXL Sent: maandag 18 april 2005 21:53 To: flexcoders@yahoogroups.com Subject: Re: [flexcoders] Simple arithmetic - resolved A number is not a number? wtf, lol! trace(!isNaN(NaN)); // false ...crud, that means it is... but how can a number that's not a number be a number? I'm confused now... Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
