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Best practices for overriding isEqual: and hash

How do you properly override isEqual: in Objective-C? The "catch" seems to be that if two objects are equal (as determined by the isEqual: method), they must have the same hash value. ...
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How to solve PHP error 'Notice: Array to string conversion in…'

I have a PHP file that tries to echo a $_POST and I get an error, here is the code: 5 Answers ...
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How to unzip a file using the command line? [closed]

Which commands can be used via the command line to unzip a file? Preferably something built into Windows or open source/free tools. ...
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capturing self strongly in this block is likely to lead to a retain cycle

How can I avoid this warning in xcode. Here is the code snippet: 7 Answers 7 ...
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ADB Shell Input Events

What is the basic difference between adb shell input keyevent and adb shell sendevent ? Which one should I use for inputting a character? Are the keycodes the same that we pass to both the commands? ...
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How to make a window always stay on top in .Net?

I have a C# winforms app that runs a macro in another program. The other program will continually pop up windows and generally make things look, for lack of a better word, crazy. I want to implement a cancel button that will stop the process from running, but I cannot seem to get the window to sta...
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Calculate distance between two latitude-longitude points? (Haversine formula)

How do I calculate the distance between two points specified by latitude and longitude? 41 Answers ...
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How to urlencode data for curl command?

I am trying to write a bash script for testing that takes a parameter and sends it through curl to web site. I need to url encode the value to make sure that special characters are processed properly. What is the best way to do this? ...
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Possible to iterate backwards through a foreach?

I know I could use a for statement and achieve the same effect, but can I loop backwards through a foreach loop in C#? ...
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How to change file encoding in NetBeans?

I want to change encoding of file in NetBeans IDE (ver 6.9.1), let's say from ANSII to UTF-8. How can I do that? 8 Answers ...