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Pastable version of Is this year a leap year?

<pre class='prettyprint' language='javascript'>Object.extend(Date.prototype, { isLeap: function(){ var year = this.getFullYear(); return (year % 4 == 0 &amp;&amp; year % 100 != 0) || (year % 100 == 0 &amp;&amp; year % 400 == 0); } });</pre> <a href="http://www.refactormycode.com/codes/14-is-this-year-a-leap-year" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://www.refactormycode.com/images/small_logo.gif" style="border:0" /></a>