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PO
primarykey
Id
4509290
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2010-12-22T12:44:27.857
FavoriteCount
0
LastActivityDate
2010-12-22T12:50:58.903
LastEditDate
2010-12-22T12:50:58.903
LastEditorUserId
157247
OwnerUserId
157247
ParentId
4509250
PostTypeId
2
Score
4
ViewCount
0
LastEditorDisplayName
text
Body
What it's doing is seeing if that property name exists in a blank object. So for instance, it will filter out <code>toString</code> (on implementations that aren't buggy about <code>toString</code> and <code>in</code>; IE is). It may be an attempt to work around people adding things to the <code>Object.prototype</code> (which is a very, very bad idea). For instance: <pre><code>Object.prototype.foo = "bar"; // <== VERY BAD IDEA alert({}.foo); // alerts "bar" function Thingy(a, b) { this.a = a; this.b = b; } Thingy.prototype.x = 42; var t = new Thingy(1, 2); </code></pre> If I want to copy <code>t</code>, including its inherited <code>x</code> property from <code>Thingy</code> but not including the <code>foo</code> property it inherits from <code>Object</code>, I could use that <code>if (name in {})</code> to skip those. Mind you, it's not a very smart way to do that, as it will fail if I do this: <pre><code>var t = new Thingy(1, 2); t.foo = "charlie"; </code></pre> Now <code>t</code> has its own <code>foo</code>, which presumably I would have wanted to copy. A more thorough check would be: <pre><code>dest = {}; blank = {}; // No need to recreate it on every iteration for (name in src) { if (src.hasOwnProperty(name) || !(name in blank)) { dest[name] = src[name]; } } </code></pre> That will only filter out ones that are inherited, or at least might be inherited, from <code>Object</code>. But even that's flawed; what if it inherits a value for the property, but not the value from <code>Object</code> (e.g., something in the middle — <code>Thingy</code> perhaps — has overridden <code>Object</code>'s default)? So you may want to refactor this code you've inherited, probably in terms of using <code>hasOwnProperty</code> and making sure that nothing anywhere in your application puts things on <code>Object.prototype</code>.
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1. POHow to understand if (name in {}) in javascript?
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1. UST.J. Crowder
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1. UST.J. Crowder
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