StackOverflow2013

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plurals

PO
primarykey
Id
2281671
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
20
CommunityOwnedDate
CreationDate
2010-02-17T14:57:51.550
FavoriteCount
0
LastActivityDate
2016-09-20T18:10:55.100
LastEditDate
2017-05-23T10:31:36.660
LastEditorUserId
-1
OwnerUserId
5445
ParentId
2281633
PostTypeId
2
Score
776
ViewCount
0
LastEditorDisplayName
text
Body
I generally use the <a href="https://developer.mozilla.org/en/JavaScript/Reference/Operators/typeof" rel="noreferrer"><code>typeof</code></a> operator: <pre><code>if (typeof obj.foo !== 'undefined') { // your code here } </code></pre> It will return <code>"undefined"</code> either if the property doesn't exist or its value is <code>undefined</code>. (See also: <a href="https://stackoverflow.com/questions/3420071/difference-between-undefined-and-not-being-defined-in-javascript/3420160#3420160">Difference between <code>undefined</code> and not being defined.</a>) There are other ways to figure out if a property exists on an object, like the <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/HasOwnProperty" rel="noreferrer"><code>hasOwnProperty</code></a> method: <pre><code>if (obj.hasOwnProperty('foo')) { // your code here } </code></pre> And the <code>in</code> operator: <pre><code>if ('foo' in obj) { // your code here } </code></pre> The difference between the last two is that the <code>hasOwnProperty</code> method will check if the property exist physically on the object (the property is not inherited). The <code>in</code> operator will check on all the properties reachable up in the prototype chain, e.g.: <pre><code>var obj = { foo: 'bar'}; obj.hasOwnProperty('foo'); // true obj.hasOwnProperty('toString'); // false 'toString' in obj; // true </code></pre> As you can see, <code>hasOwnProperty</code> returns <code>false</code> and the <code>in</code> operator returns <code>true</code> when checking the <code>toString</code> method, this method is defined up in the prototype chain, because <code>obj</code> inherits form <code>Object.prototype</code>.
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