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How does an underscore in front of a variable in a cocoa objective-c class work?
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@LearnCocos2D Hi! A newbie to iOS here and there's something I need to clarify. For all this time what I did was declare the property in the .h file and in the .m fie I access it using self like so, self.someProperty. Is this the right way? Or should I be using th...
How to convert a private key to an RSA private key?
Let me explain my question first. I bought a certificate from a CA and used the following format to generate the csr and the private key:
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Is there a way to word-wrap long words in a div?
...rd-wrap: break-word; /* IE */
}
I've used this class for a bit now, and works like a charm. (note: I've only tested in FireFox and IE)
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Displaying better error message than “No JSON object could be decoded”
...one.com (Python 3.7.3) shows that the stdlib json library has been updated and gives the new error message format. I don’t have time to track exact releases right now however.
– Martijn Pieters♦
Mar 14 at 0:29
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How do I get a substring of a string in Python?
...'d!'
>>> x[2:-2]
'llo Worl'
Python calls this concept "slicing" and it works on more than just strings. Take a look here for a comprehensive introduction.
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Iteration ng-repeat only X times in AngularJs
...ular comes with a limitTo:limit filter, it support limiting first x items and last x items:
<div ng-repeat="item in items|limitTo:4">{{item}}</div>
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HTML5 Email Validation
...your email">
<input type="submit" value="Submit">
</form>
And when the user press submit, it automatically shows an error message like:
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Why is it faster to check if dictionary contains the key, rather than catch the exception in case it
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On the one hand, throwing exceptions is inherently expensive, because the stack has to be unwound etc.
On the other hand, accessing a value in a dictionary by its key is cheap, because it's a fast, O(1) operation.
BTW: The correct way t...
Printing the last column of a line in a file
...ed. tail -f means wait for more input, but there are no more lines in file and so the pipe to grep is never closed.
If you omit -f from tail the output is shown immediately:
tail file | grep A1 | awk '{print $NF}'
@EdMorton is right of course. Awk can search for A1 as well, which shortens the ...
How Many Seconds Between Two Dates?
So I have two dates YYYY-MM-DD and ZZZZ-NN-EE
9 Answers
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