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    <p>Interesting question. The answer lies in the <a href="http://es5.github.com/#x12.6.4" rel="nofollow">specification</a> (emphasis mine):</p> <blockquote> <p>The mechanics and order of enumerating the properties (step 6.a in the first algorithm, step 7.a in the second) <strong>is not specified</strong>. Properties of the object being enumerated may be deleted during enumeration. <strong>If a property that has not yet been visited during enumeration is deleted, then it will not be visited.</strong> If new properties are added to the object being enumerated during enumeration, the <strong>newly added properties are not guaranteed to be visited</strong> in the active enumeration. A property name must not be visited more than once in any enumeration.</p> </blockquote> <p>So it is explicitly specified that a deleted property must not be traversed anymore. However, the behaviour for adding a new property is implementation dependent, most likely because it is not defined how properties should be stored internally.</p> <p>For example in Chrome, it seems that numeric properties are stored before alphabetical ones:</p> <pre><code>&gt; Object.keys({a:0, 0:1}); ["0", "a"] </code></pre> <p>However, even if you add alphabetical keys:</p> <pre><code>var obj = {a:0,b:0}; for (var k in obj) { obj['c'] = 0; console.log(k); } </code></pre> <p><code>c</code> does not seem to be traversed, the output is <code>a b</code>.</p> <p>Firefox shows the same behaviour, although keys are stored in insertion order:</p> <pre><code>&gt; Object.keys({a:0, 0:1}); ["a", "0"] </code></pre>
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    1. POfor in loop and the delete operator
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    1. USFelix Kling
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    1. POfor in loop and the delete operator
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    1. COexcellent! its espescially good to know that the loop could potentially be infinite in some implementations.
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    2. COYes, this is definitely something to watch out for.
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