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    <p>Simple enough:</p> <pre><code>for(var propertyName in myObject) { // propertyName is what you want // you can get the value like this: myObject[propertyName] } </code></pre> <p>Now, you will not get private variables this way because they are not available.</p> <hr> <p>EDIT: <a href="https://stackoverflow.com/questions/85992/how-do-i-enumerate-the-properties-of-a-javascript-object#86306">@bitwiseplatypus</a> is correct that unless you use the <code>hasOwnProperty()</code> method, you will get properties that are inherited - however, I don't know why anyone familiar with object-oriented programming would expect anything less! Typically, someone that brings this up has been subjected to Douglas Crockford's warnings about this, which still confuse me a bit. Again, inheritance is a normal part of OO languages and is therefore part of JavaScript, notwithstanding it being prototypical.</p> <p>Now, that said, <code>hasOwnProperty()</code> <em>is</em> useful for filtering, but we don't need to sound a warning as if there is something dangerous in getting inherited properties.</p> <p>EDIT 2: <a href="https://stackoverflow.com/questions/85992/how-do-i-enumerate-the-properties-of-a-javascript-object#86306">@bitwiseplatypus</a> brings up the situation that would occur should someone add properties/methods to your objects at a point in time later than when you originally wrote your objects (via its prototype) - while it is true that this might cause unexpected behavior, I personally don't see that as my problem entirely. Just a matter of opinion. Besides, what if I design things in such a way that I use prototypes during the construction of my objects and yet have code that iterates over the properties of the object and I want all inherited properties? I wouldn't use <code>hasOwnProperty()</code>. Then, let's say, someone adds new properties later. Is that my fault if things behave badly at that point? I don't think so. I think this is why jQuery, as an example, has specified ways of extending how it works (via <code>jQuery.extend</code> and <code>jQuery.fn.extend</code>).</p>
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    1. POHow do I enumerate the properties of a JavaScript object?
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    1. USJason Bunting
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    1. COI think @bitwiseplatypus is just saying "be careful". It's my opinion that JavaScript's for/in should only be taught accompanied by a mention of hasOwnProperty() and other less-than-obvious edge-cases of prototypal inheritance.
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      1. USpcorcoran
    2. COInterestingly this does not work for getter properties defined with Object.defineProperty but does work for direct getters. See my [jsfiddle](http://jsfiddle.net/Sgf8N/4/).
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    3. COI think *most* people are surprised that `for(x in {})` enumerates anything at all, since it looks like a simple dictionary key iteration. It's very unexpected and definitely merits special warning.
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      1. USGlenn Maynard
 

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