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What's the $unwind operator in MongoDB?

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Possibility of duplicate Mongo ObjectId's being generated in two different collections?

Is it possible for the same exact Mongo ObjectId to be generated for a document in two different collections? I realize that it's definitely very unlikely, but is it possible? ...
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base64 encoded images in email signatures

I have to include some images (company logo's etc) in email signatures. I've had all sorts of issues using the embedded images produced by the email system in question (they get sent as attachments generally) and as linked images (requiring permission to display them in the email received). ...
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What does `someObject.new` do in Java?

In Java, I have just found out that the following code is legal: 5 Answers 5 ...
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Add new item count to icon on button - Android

I'm developer. I need to implement design shown below. I already have functional app but wonder how to even approach this? Particulary, I'm interested in how to show Number of "New" items under tabs. What I KNOW how to do - is create new icons with red dots and just display them when new stuff avail...
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How to permanently export a variable in Linux?

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How to generate random SHA1 hash to use as ID in node.js?

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Using awk to remove the Byte-order mark

How would an awk script (presumably a one-liner) for removing a BOM look like? 5 Answers ...
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Easiest way to toggle 2 classes in jQuery

If I have class .A and class .B and want to switch in between on button click, what's a nice solution for that in jQuery? I still don't understand how toggleClass() works. ...
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What is the difference between server side cookie and client side cookie?

What is the difference between creating cookies on the server and on the client? Are these called server side cookies and client side cookies? Is there a way to create cookies that can only be read on the server or on the client? ...