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return, return None, and no return at all?

...e actual behavior, there is no difference. They all return None and that's it. However, there is a time and place for all of these. The following instructions are basically how the different methods should be used (or at least how I was taught they should be used), but they are not absolute rules s...
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What is a good choice of database for a small .NET application? [closed]

I'm developing a small application with C# in .NET and I want to have a small light weight database which does not use much resources. ...
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Android Studio quick documentation always “fetching documentation”

I just move to Android studio from eclipse,I found that it always shows "fetching documentation" when I use quick documentation(Ctrl+Q),How to solve this?(I download documentation for API19,still problem) ...
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What is the main difference between PATCH and PUT request?

... PATCH method requests that a set of changes described in the request entity be applied to the resource identified by the Request- URI. The set of changes is represented in a format called a "patch document" identified by a media type. If the Request-URI does not point to an existing resour...
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Is JavaScript a pass-by-reference or pass-by-value language?

The primitive types (number, string, etc.) are passed by value, but objects are unknown, because they can be both passed-by-value (in case we consider that a variable holding an object is in fact a reference to the object) and passed-by-reference (when we consider that the variable to the object hol...
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Why is it important to override GetHashCode when Equals method is overridden?

... Yes, it is important if your item will be used as a key in a dictionary, or HashSet<T>, etc - since this is used (in the absence of a custom IEqualityComparer<T>) to group items into buckets. If the hash-code for two i...
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What is the “volatile” keyword used for?

...read some articles about the volatile keyword but I could not figure out its correct usage. Could you please tell me what it should be used for in C# and in Java? ...
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Git Extensions: Win32 error 487: Couldn't reserve space for cygwin's heap, Win32 error 0

Git Extensions: Everything was working fine until yesterday. 14 Answers 14 ...
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What does 'var that = this;' mean in JavaScript?

... I'm going to begin this answer with an illustration: var colours = ['red', 'green', 'blue']; document.getElementById('element').addEventListener('click', function() { // this is a reference to the element clicked on var that = this; colours.f...
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Using async/await for multiple tasks

...g an API client that is completely asynchrounous, that is, each operation either returns Task or Task<T> , e.g: 6 ...