[Javascript] Is integer?

[john at jwarner.com (John Warner)]

A leap year is any year that can be divided evenly by 4 (year % 4 = 0)
but years ending in 00 (2000, 1900, 2100) must  (00Year % 400 = 0) so
2000 is a leap year, 2100 is NOT even though it can be divided by 4, but
not 400.

John Warner


> -----Original Message-----
> From: javascript-bounces@xxxxxxxxxx 
> [mailto:javascript-bounces@xxxxxxxxxx] On Behalf Of Allard Schripsema
> Sent: Monday, May 29, 2006 9:45 AM
> To: [JavaScript List]
> Subject: RE: [Javascript] Is integer?
> 
> 
> Hi
> the right word in English is leapyear.
> You can use the modulus operator (it shows what's left after 
> you divide the two values):
> 
> function isLeapYear(year) {
> 	if ((year % 4) == 0) {
> 		return true;
> 	} else{
> 		return false;
> 	}
> }
> 
> Another thing: the rules of a leapyear are a bit more complex 
> than the simple dividable by 4 as far as i know....
> 
> Hope this helps,
> 
> allard Schripsema
> www.VisualDigital.com.br
> 
> -----Original Message-----
> From: javascript-bounces@xxxxxxxxxx 
> [mailto:javascript-bounces@xxxxxxxxxx]On Behalf Of Peter 
> Lauri
> Sent: Monday, May 29, 2006 5:28 AM
> To: javascript@xxxxxxxxxx
> Subject: [Javascript] Is integer?
> 
> 
> Best group member,
> 
> Is there any function that checks if something is an integer? 
> I did not find one and created this temporary function:
> 
> function isInteger(thenumber) {
> 	thenumberceil = Math.ceil(thenumber);
> 	if(thenumberceil>thenumber) return false;
> 	else return true;
> }
> 
> Why I actually need this is because I need to find out if a 
> year is a "skott year" (do not know the English word, but the 
> years when February has 29 days instead of 28). Is there any 
> function for that? I created this temporary
> function:
> 
> function isSkottYear(y) {
> 	yeardiv = y/4;
> 	if(isInteger(yeardiv)) return true;
> 	else return false;
> }
> 
> There is probably better ways of doing this, are they?
> 
> Best regards,
> Peter Lauri
> 
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