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    <p>One thing you do get with <code>.each()</code> is automatic local scoping (because you are invoking an anonymous function for every object), which in turn means if you are creating even more anonymous functions/closures/event handlers/whatever on every iteration, you never have to worry about your handlers sharing a variable. That is, JavaScript doesn't act like other languages when it comes to local scopes, but because you can declare a variable anywhere, it can fool you sometimes.</p> <p>In other words, this is wrong:</p> <pre><code>var idx,el; for (idx = 0; idx &lt;someObjectArray.length; idx++){ el = someObjectArray[idx] el.someEventHandler(function(){ alert( "this is element " + idx); }); } </code></pre> <p>Whenever any of those objects invoke their "someEvent" after this loop (please note that this is made up), the alert is always going to say whatever was last assigned to <code>idx</code>, which should be (as of the time invoked) <code>someObjectArray.length</code>;</p> <p>To make sure you save the proper index, you have to declare a local scope, create a variable and assign to that variable for use.</p> <pre><code>var idx,el; for (idx = 0; idx &lt;someObjectArray.length; idx++){ el = someObjectArray[idx]; (function(){ var localidx = idx; el.someEventHandler(function(){ alert( "this is element " + localidx); }); })(); } </code></pre> <p>As you can see, that's as ugly as hell, but it should work. Each event handler gets its own copy of <code>localidx</code></p> <p>Now compare that to <code>.each()</code></p> <pre><code>$(someObjectArray).each(function (idx, el) { el.someEventHandler(function(){ alert( "this is element " + idx); }); }); </code></pre> <p>A lot simpler, isn't it?</p>
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    1. PO$.each() vs for() loop - and performance
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    1. COVery true! I actually forgot for a second it already does this for you... I suppose the biggest thing to take from it all is that if you want simple manipulation | get/set type things an easy for() w plain JS is really the way to go. For much more complicated filtering & eventHandlers you almost need each(). Interesting...
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      1. USMark Pieszak - DevHelp.Online
 

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