JavaScript is a language we love despite it giving us so much to hate. This is a collection of those very special irregularities, inconstancies and just plain painfully unintuitive moments for the language of the web.Tumblr (3.0; @jswtf)http://jswtf.tumblr.com/<script src="http://gist.github.com/404309.js?file=deadlyicon-update.js"></script><br/><br/><p>An update by <a href="http://twitter.com/deadlyicon">@deadlyicon</a> on the previous post.</p>http://jswtf.tumblr.com/post/608035057http://jswtf.tumblr.com/post/608035057Mon, 17 May 2010 18:22:37 -0400<script src="http://gist.github.com/398962.js?file=alert-call-wtf.js"></script><br/><br/><p>That must be some good shit <a href="http://twitter.com/cramforce">@cramforce</a> was smoking when he found this one.</p>http://jswtf.tumblr.com/post/593017183http://jswtf.tumblr.com/post/593017183Wed, 12 May 2010 14:44:41 -0400<script src="http://gist.github.com/353862.js?file=coerce-fun.js"></script><br/><br/><p>Thanks to <a href="http://ajaxian.com/archives/a-very-detailed-look-at-object-to-primitive-conversions">Ajaxian</a> for pointing out this <a href="http://www.adequatelygood.com/2010/3/Object-to-Primitive-Conversions-in-JavaScript">amazingly detailed look at object to primitive coercion</a>.</p>http://jswtf.tumblr.com/post/492012943http://jswtf.tumblr.com/post/492012943Fri, 02 Apr 2010 19:17:00 -0400<script src="http://gist.github.com/322362.js?file=max-value-wtf.js"></script><br/><br/><p><a href="http://twitter.com/pbakaus">@pbakaus</a> points out that Number.MAX_VALUE is close to infinity, but not too close.</p>http://jswtf.tumblr.com/post/427280212http://jswtf.tumblr.com/post/427280212Thu, 04 Mar 2010 20:41:31 -0500<script src="http://gist.github.com/319972.js?file=stack-overflow-ie.js"></script><br/><br/><p><a href="http://twitter.com/tlrobinson">@tlrobinson</a> of <a href="http://280north.com/">280 North</a>, <a href="http://cappuccino.org/">Cappuccino</a>, <a href="http://narwhaljs.org/">Narwhal</a> and <a href="http://commonjs.org/">CommonJS</a> points out some lovely IE behavior in <a href="http://cappuccino.org/discuss/2010/03/01/internet-explorer-global-variables-and-stack-overflows/">this great blog post</a>. WTFIE should really be a blog of its own.</p>http://jswtf.tumblr.com/post/422655499http://jswtf.tumblr.com/post/422655499Tue, 02 Mar 2010 16:34:53 -0500<script src="http://gist.github.com/316313.js?file=gistfile1.js"></script><br/><br/><p>This is a fun one with type coercion. It comes from John Resig’s explanation here:</p> <p><a href="http://news.ycombinator.com/item?id=1154338"><a href="http://news.ycombinator.com/item?id=1154338">http://news.ycombinator.com/item?id=1154338</a></a></p>http://jswtf.tumblr.com/post/414126523http://jswtf.tumblr.com/post/414126523Fri, 26 Feb 2010 18:39:00 -0500<script src="http://gist.github.com/316141.js?file=gistfile1.js"></script><br/><br/><p>More fun with implicit .toString() calls and also String instantiation</p>http://jswtf.tumblr.com/post/413856021http://jswtf.tumblr.com/post/413856021Fri, 26 Feb 2010 15:52:48 -0500<script src="http://gist.github.com/315279.js?file=more-ie-fun.js"></script><br/><br/><p><a href="http://twitter.com/jaffathecake">@jaffathecake</a> has some more fun with IE. As we do.</p> <p><a href="http://twitter.com/filmaj">@filmaj</a> says, “I think it’s because object equality implicitly calls toString(), and in IE most native DOM objects return just ‘[object]’ in toString(), whereas standard browser return something like ‘[object ClassName]’, which is probably why WebKit doesn’t do the same thing.”</p> <p>Fuckin IE, eh.</p>http://jswtf.tumblr.com/post/412178432http://jswtf.tumblr.com/post/412178432Thu, 25 Feb 2010 20:12:18 -0500<script src="http://gist.github.com/306014.js?file=gistfile1.js"></script><br/><br/><p>Interesting how IE and WebKit treat this differently than Firefox and Opera. Some sort of pre-compilation going on? Who knows. Thanks <a href="http://twitter.com/jeronevw">@jeronevw</a>!</p>http://jswtf.tumblr.com/post/412170001http://jswtf.tumblr.com/post/412170001Thu, 25 Feb 2010 20:08:05 -0500<script src="http://gist.github.com/314772.js?file=gistfile1.txt"></script><br/><br/><p>When going through the result of Google’s closure compiler, I found that it had compressed 1000 to 1E3 - brilliant! - <a href="http://twitter.com/rem">@rem</a></p>http://jswtf.tumblr.com/post/411442291http://jswtf.tumblr.com/post/411442291Thu, 25 Feb 2010 12:31:00 -0500<script src="http://gist.github.com/312977.js?file=Number.js"></script><br/><br/><p><a href="http://twitter.com/rcanine">@rcanine</a> shows us this interesting <em>this</em> coerce behavior within the prototype of Number. Fun!</p>http://jswtf.tumblr.com/post/409374681http://jswtf.tumblr.com/post/409374681Wed, 24 Feb 2010 12:54:47 -0500<script src="http://gist.github.com/306021.js?file=wtf.js"></script><br/><br/><p>Nice arguments hackery going on here. Thanks to <a href="http://github.com/deadlyicon">deadlyicon</a>!</p>http://jswtf.tumblr.com/post/407742505http://jswtf.tumblr.com/post/407742505Tue, 23 Feb 2010 17:58:31 -0500<script src="http://gist.github.com/312630.js?file=boolean-madness.js"></script><br/><br/><p>Boolean logic paradox via <a href="http://twitter.com/amattie">amattie</a>!</p>http://jswtf.tumblr.com/post/407444543http://jswtf.tumblr.com/post/407444543Tue, 23 Feb 2010 14:54:46 -0500<script src="http://gist.github.com/312625.js?file=octal-type-coerce.js"></script><br/><br/><p>Careful w/ number type coercion! Thanks <a href="http://twitter.com/kelemen_viktor">kelemen_viktor</a>!</p>http://jswtf.tumblr.com/post/407441633http://jswtf.tumblr.com/post/407441633Tue, 23 Feb 2010 14:52:34 -0500<script src="http://gist.github.com/312606.js?file=boolean-wtf.js"></script><br/><br/><p>Ha! This one is great. Remember how <a href="http://wtfjs.com/post/392133220/atomfusion-shows-us-that-true-sometimes-has-a">true sometimes has a value</a> so in the above 3 > 2 evaluates to true making the second part of the expression evaluate true > 1 which is false. Of course! Thanks to <a href="http://twitter.com/void_0">void_0</a> for this one!</p>http://jswtf.tumblr.com/post/407422733http://jswtf.tumblr.com/post/407422733Tue, 23 Feb 2010 14:38:22 -0500<script src="http://gist.github.com/312583.js?file=var-init.js"></script><br/><br/><p>Of course, the variable is undefined because its being declared but not initialized until after the document.write in the function context which itself runs before the first declaration of a. Yowza. <a href="http://weblog.bocoup.com/weird-var-behavior-in-javascript">Cheers to Boaz, Al & Rick for this one!</a></p>http://jswtf.tumblr.com/post/407408160http://jswtf.tumblr.com/post/407408160Tue, 23 Feb 2010 14:27:07 -0500<script src="http://gist.github.com/308488.js?file=concat_wtf.js"></script><br/><br/><p>More concat “fun”.</p>http://jswtf.tumblr.com/post/398099348http://jswtf.tumblr.com/post/398099348Fri, 19 Feb 2010 01:20:35 -0500<script src="http://gist.github.com/305967.js?file=laughable.js"></script><br/><br/><p>I’m certain that this will end all debate about where curly braces belong… right?</p> <p>UPDATE: check out this v8 behaviour: <a href="http://gist.github.com/308492">http://gist.github.com/308492</a> </p>http://jswtf.tumblr.com/post/393377619http://jswtf.tumblr.com/post/393377619Tue, 16 Feb 2010 16:45:00 -0500<script src="http://gist.github.com/305920.js"></script><br/><br/><p>JavaScript has a ludicrous list of <a href="https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Reserved_Words">reserved words</a>; most of them aren’t even used as keywords in the language. Modern browsers allow using <i>most</i> of these words as identifiers, despite what the spec says. But Safari doesn’t like <code>enum</code> for some reason.</p>http://jswtf.tumblr.com/post/393323389http://jswtf.tumblr.com/post/393323389Tue, 16 Feb 2010 16:11:27 -0500<script src="http://gist.github.com/305567.js?file=gistfile1.js"></script><br/><br/><p>In my quest to find whether Infinity was a finite number, I found this. Two numbers that are different are the exact same. Possibly some overflow going on here? - <a href="http://twitter.com/rem">@rem</a></p>http://jswtf.tumblr.com/post/392836203http://jswtf.tumblr.com/post/392836203Tue, 16 Feb 2010 09:56:32 -0500