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Retain cycle on `self` with blocks

I'm afraid this question is pretty basic, but I think it's relevant to a lot of Objective-C programmers who are getting into blocks. ...
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How to force JS to do math instead of putting two strings together

I need javascript to add 5 to an integer variable, but instead it treats the variable as a string, so it write out the variable, then add 5 onto the end of the "string". How can I force it to do math instead? ...
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How do I tell Matplotlib to create a second (new) plot, then later plot on the old one?

I want to plot data, then create a new figure and plot data2, and finally come back to the original plot and plot data3, kinda like this: ...
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How does the ThreadStatic attribute work?

How does [ThreadStatic] attribute work? I assumed that the compiler would emit some IL to stuff/retrieve the value in the TLS, but looking at a disassembly it doesn't seem to do it at that level. ...
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What is the difference between NULL, '\0' and 0?

In C, there appear to be differences between various values of zero -- NULL , NUL and 0 . 11 Answers ...
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How do I use a compound drawable instead of a LinearLayout that contains an ImageView and a TextView

Ran the new Lint tool against my code. It came up with a lot of good suggestions, but this one I cannot understand. 4 Answ...
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How do I get currency exchange rates via an API such as Google Finance? [closed]

Now, I did find the Google Finance API and started looking through that but I found a lot of info about portfolios, transactions, positions & other stuff I know nothing about. ...
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Why does this code segfault on 64-bit architecture but work fine on 32-bit?

I came across the following C puzzle: 3 Answers 3 ...
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Plotting time in Python with Matplotlib

I have an array of timestamps in the format (HH:MM:SS.mmmmmm) and another array of floating point numbers, each corresponding to a value in the timestamp array. ...
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What are rvalues, lvalues, xvalues, glvalues, and prvalues?

In C++03, an expression is either an rvalue or an lvalue . 11 Answers 11 ...