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What is a race condition?
...ce condition occurs when two or more threads can access shared data and they try to change it at the same time. Because the thread scheduling algorithm can swap between threads at any time, you don't know the order in which the threads will attempt to access the shared data. Therefore, the result of...
Cropping an UIImage
...rop mode to achieve the same results, but these images are sometimes displayed in UIWebViews ).
24 Answers
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Argparse: Required argument 'y' if 'x' is present
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No, there isn't any option in argparse to make mutually inclusive sets of options.
The simplest way to deal with this would be:
if args.prox and (args.lport is None or args.rport is None):
parser.error("--prox requires --lport and --rpor...
PHP Regex to check date is in YYYY-MM-DD format
I'm trying to check that dates entered by end users are in the YYYY-MM-DD. Regex has never been my strong point, I keep getting a false return value for the preg_match() I have setup.
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What is the difference between an expression and a statement in Python?
In Python, what is the difference between expressions and statements?
14 Answers
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Mapping two integers to one, in a unique and deterministic way
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You're looking for a bijective NxN -> N mapping. These are used for e.g. dovetailing. Have a look at this PDF for an introduction to so-called pairing functions. Wikipedia introduces a specific pairing function, namely the...
In Node.js, how do I “include” functions from my other files?
Let's say I have a file called app.js. Pretty simple:
26 Answers
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Unpacking array into separate variables in JavaScript
...problem, and I've done it before. I just can't remember how, or what exactly it was called.
7 Answers
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How to search and replace globally, starting from the cursor position and wrapping around the end of
...e cursor position before starting actual replacements, the
line addressed by '' is the line that was the current one before
that substitution command was run. (The '' address refers to the
' pseudo-mark; see :help :range and :help '' for details.)
Note that the second command (after the | comman...
javascript scroll event for iPhone/iPad?
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The iPhoneOS does capture onscroll events, except not the way you may expect.
One-finger panning doesn’t generate any events until the user stops panning—an onscroll event is generated when the page stops moving and redraws—as shown in Figure 6-1.
Similarly, scroll w...