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Does JSON syntax allow duplicate keys in an object?

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Tree data structure in C#

I was looking for a tree or graph data structure in C# but I guess there isn't one provided. An Extensive Examination of Data Structures Using C# 2.0 explains a bit about why. Is there a convenient library which is commonly used to provide this functionality? Perhaps through a strategy pattern t...
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Polymorphism vs Overriding vs Overloading

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Detect if an input has text in it using CSS — on a page I am visiting and do not control?

Is there a way to detect whether or not an input has text in it via CSS? I've tried using the :empty pseudo-class, and I've tried using [value=""] , neither of which worked. I can't seem to find a single solution to this. ...
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Mipmap drawables for icons

Since Android 4.3 (Jelly Bean) we can now make use of the res/mipmap folders to store "mipmap" images. 11 Answers ...
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Assignment inside lambda expression in Python

I have a list of objects and I want to remove all objects that are empty except for one, using filter and a lambda expression. ...
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What is stability in sorting algorithms and why is it important?

I'm very curious, why stability is or is not important in sorting algorithms? 10 Answers ...
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Write a program that will surely go into deadlock [closed]

I recently got this questions asked in an interview. 13 Answers 13 ...
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When is it acceptable to call GC.Collect?

The general advise is that you should not call GC.Collect from your code, but what are the exceptions to this rule? 24 An...
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Why JSF calls getters multiple times

Let's say I specify an outputText component like this: 9 Answers 9 ...