StackOverflow2013

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plurals

PO
primarykey
Id
5511032
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2011-04-01T08:45:47.957
FavoriteCount
0
LastActivityDate
2011-04-01T09:00:23.723
LastEditDate
2017-05-23T12:19:54.093
LastEditorUserId
-1
OwnerUserId
448296
ParentId
5510772
PostTypeId
2
Score
6
ViewCount
0
LastEditorDisplayName
text
Body
The <code>in</code> operator returns true if the property is in the object. This includes a lookup right up through the prototype chain. For example: <pre><code>Object.prototype.k = 5; f = {}; 'k' in f; // true </code></pre> Even though <code>f</code> is an empty object, it's prototype (as all types in JS) includes that of <code>Object</code>, which has the property <code>'k'</code>. Although you didn't ask, a useful function here to check the object's own properties only, is <code>.hasOwnProperty()</code>, so in our example above: <pre><code>f.hasOwnProperty('k'); // false, that's more what we would expect </code></pre> Although for arrays you don't (usually) want to iterate over all properties, since these properties may include things other than index values, so both for reasons of performance and expected behaviour, a regular <code>for(var i=0;i<n;i++)</code> should be used. As such, if you're using arrays go with <code>in_array_orig</code>, and for objects where you are interested in their properties, use <code>in_array_new</code> (which should be renamed appropriately, <code>in_obj</code> or something). In addition, <code>[1] == [1]</code> returns false since the two objects/arrays are not the same object. Indeed each of their properties and indexes have the same value, although they aren't sitting at the same place in memory, and thus are not considered equal. You can easily build (<a href="https://stackoverflow.com/questions/1068834/object-comparison-in-javascript">or find on the net</a>) a deep search <code>equals()</code> routine to check whether two objects/arrays are indeed equal in value (as opposed to address).
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1. POfor(var i in aArray) VS for(i=0; i<aArray.length; i++)
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1. PTAnswer
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1. USCommunity
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1. USdavin
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1. POfor(var i in aArray) VS for(i=0; i<aArray.length; i++)
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1. COwow thanks for detailed explanation
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