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What is Android keystore file, and what is it used for?

This is a general question, but particularly I am interested in it's use for Android. What is a keystore file, and what is it used for? ...
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parseInt(null, 24) === 23… wait, what?

Alright, so I was messing around with parseInt to see how it handles values not yet initialized and I stumbled upon this gem. The below happens for any radix 24 or above. ...
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What is the best way to create constants in Objective-C

I am creating a Reddit client for learning purposes. I need to have a file with constants in it. I was thinking about importing the file in the Reddit-Prefix.pch file to make the constants available to all the files. Is it a good way of doing things? Also, I've done my research and found several...
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Replace selector images programmatically

I have an ImageView that has a drawable image resource set to a selector. How do I programmatically access the selector and change the images of the highlighted and non-highlighted state? ...
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Elastic search, multiple indexes vs one index and types for different data sets?

I have an application developed using the MVC pattern and I would like to index now multiple models of it, this means each model has a different data structure. ...
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What does “mro()” do?

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C++ equivalent of Java's toString?

I'd like to control what is written to a stream, i.e. cout , for an object of a custom class. Is that possible in C++? In Java you could override the toString() method for similar purpose. ...
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how to ignore namespaces with XPath

My goal is to extract certain nodes from multiple xml files with multiple namespaces using XPath. Everything works fine as long as i know the namespace URIs. The namespace name itself remains constant, but the Schemas (XSD) are sometimes client-generated i.e. unknown to me. Then i am left with basic...
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WaitAll vs WhenAll

What is the difference between Task.WaitAll() and Task.WhenAll() from the Async CTP ? Can you provide some sample code to illustrate the different use cases ? ...
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How to use jQuery in chrome extension?

I am writing a chrome extension. And I want to use jQuery in my extension. I am not using any background page , just a background script . ...