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mongoDB/mongoose: unique if not null

... answered Mar 13 '12 at 22:23 JohnnyHKJohnnyHK 253k5151 gold badges537537 silver badges424424 bronze badges ...
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Grep and Sed Equivalent for XML Command Line Processing

...wk. :) – Charles Duffy May 3 '12 at 22:23 add a comment  |  ...
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JPanel Padding in Java

... | edited Sep 22 '15 at 11:29 Nateowami 8251414 silver badges2222 bronze badges answered Mar...
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How can I inspect disappearing element in a browser?

...will allow you to interact with the element in a paused state. Update Oct 22 2019: with the release of v. 70, it looks like FireFox finally supports this kind of debugging 2 3: Update Sep 15 2020: Chrome has an "Emulate a focused page" option (you can get it from the [⌘]+[P] Command Menu, or Glo...
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Strange \n in base64 encoded string in Ruby

... 227 Edit: Since i wrote this answer Base64.strict_encode64() was added, which does not add newline...
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MySQL: Fastest way to count number of rows

... answered Feb 20 '11 at 22:03 Mārtiņš BriedisMārtiņš Briedis 15.6k55 gold badges4747 silver badges6767 bronze badges ...
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Is it possible to have empty RequestParam values use the defaultValue?

... answered Sep 22 '12 at 0:18 MattMatt 2,94511 gold badge1414 silver badges66 bronze badges ...
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Pass request headers in a jQuery AJAX GET call

... – Ghanshyam Baravaliya May 6 '16 at 13:22 4 ...
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What is “rvalue reference for *this”?

... answered Dec 22 '11 at 23:09 XeoXeo 121k4141 gold badges273273 silver badges379379 bronze badges ...
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Number of occurrences of a character in a string [duplicate]

... answered Apr 30 '12 at 22:41 Michael FrederickMichael Frederick 17k33 gold badges4141 silver badges5757 bronze badges ...