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mongoDB/mongoose: unique if not null

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How to build an android library with Android Studio and gradle?

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Android Studio - Where can I see callstack while debugging an android app?

... Basem Saadawy 1,74822 gold badges1919 silver badges2929 bronze badges answered Jan 12 '15 at 13:37 Nickolai Astashonok...
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Cross-referencing commits in github

... GitHub help: User/Project@SHA For example: mojombo/god@be6a8cc1c1ecfe9489fb51e4869af15a13fc2cd2 Short SHAs work as well (as long as they are unique): mojombo/god@be6a8cc share | improve thi...
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Aligning a float:left div to center?

... answered Apr 2 '11 at 14:12 clairesuzyclairesuzy 25.5k77 gold badges5050 silver badges5151 bronze badges ...
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Python, remove all non-alphabet chars from string

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How to write a JSON file in C#?

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How can I reference the value of a final static field in the class?

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Optional query string parameters in ASP.NET Web API

... This issue has been fixed in the regular release of MVC4. Now you can do: public string GetFindBooks(string author="", string title="", string isbn="", string somethingelse="", DateTime? date= null) { // ... } and everything will work out of the box. ...