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Can someone explain the traverse function in Haskell?
... of Applicative models) and your language doesn't have it built-in, you're out of luck.
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Is there a good jQuery Drag-and-drop file upload plugin? [closed]
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Check out the recently1 released upload handler from the guys that created the TinyMCE editor. It has a jQuery widget and looks like it has a nice set of features and fallbacks.
http://www.plupload.com/
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ArrayIndexOutOfBoundsException when using the ArrayList's iterator
...)
if (s.equals(value))
// ...
As for
java.lang.ArrayIndexOutOfBoundsException: -1
You just tried to get element number -1 from an array. Counting starts at zero.
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How to convert local time string to UTC?
... the pytz module, which comes with a full list of time zones + UTC. Figure out what the local timezone is, construct a timezone object from it, and manipulate and attach it to the naive datetime.
Finally, use datetime.astimezone() method to convert the datetime to UTC.
Source code, using local tim...
django syncdb and an updated model
...umentation.
For Django 1.6 and earlier
Django doesn't support migrations out of the box. There is a pluggable app for Django that does exactly that though, and it works great. It's called South.
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Generating random integer from a range
...better than yours, but still not properly uniform distributed solution is
output = min + (rand() % static_cast<int>(max - min + 1))
Except when the size of the range is a power of 2, this method produces biased non-uniform distributed numbers regardless the quality of rand(). For a comprehe...
Callback functions in C++
...p; v) { v += r; });
std::for_each(v.begin(), v.end(), [](double v) { std::cout << v << " "; });
which prints
5 6.2 8 9.5 11.2
Another application of callbacks is the notification of callers of certain events which enables a certain amount of static / compile time flexibility.
Perso...
Enabling HTTPS on express.js
... trying to get HTTPS working on express.js for node, and I can't figure it out.
7 Answers
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Retain cycle on `self` with blocks
..., __weak is fine as well. If you know for a fact that the object cannot be out of scope when the block is invoked then __unsafe_unretained is ever so slightly faster, but in general that won't make a difference. If you do use __weak, make sure to throw it into a __strong local variable and test that...
How to stop unwanted UIButton animation on title change?
In iOS 7 my UIButton titles are animating in and out at the wrong time - late. This problem does not appear on iOS 6. I'm just using:
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