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How to randomize (shuffle) a JavaScript array?
...It picks a random element for each original array element, and excludes it from the next draw, like picking randomly from a deck of cards.
This clever exclusion swaps the picked element with the current one, then picks the next random element from the remainder, looping backwards for optimal effici...
How do you prevent IDisposable from spreading to all your classes?
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You can't really "prevent" IDisposable from spreading. Some classes need to be disposed, like AutoResetEvent, and the most efficient way is to do it in the Dispose() method to avoid the overhead of finalizers. But this method must be called somehow, so exactly as ...
CocoaPods - use specific pod version
...e terminal for the change to take place. Of course, this needs to be done from your project's top level folder. If the update does not occur, edit your Podfile.lock file and change the AFNetworking version # to something less than what it is and issue a pod update in the terminal again. This tell...
Git interoperability with a Mercurial Repository
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Update from June 2012. Currently there seem to be the following methods for Git/Hg interoperability when the developer wants to work from the git side:
Install Mercurial and the hg-git extension. You can do the latter using your p...
allowDefinition='MachineToApplication' error when publishing from VS2010 (but only after a previous
...he package folder (located inside the obj\Debug and/or obj\Release folder) from your project folder otherwise you'll keep getting the error.
FWIW, MS know about this error...
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How can I sharpen an image in OpenCV?
...ing:
You use a Gaussian smoothing filter and subtract the smoothed version from the original image (in a weighted way so the values of a constant area remain constant).
To get a sharpened version of frame into image: (both cv::Mat)
cv::GaussianBlur(frame, image, cv::Size(0, 0), 3);
cv::addWeighted(f...
How to create a memory leak in Java?
...clears all references to the custom class or the ClassLoader it was loaded from.
Repeat.
Due to the way ThreadLocal is implemented in Oracle's JDK, this creates a memory leak:
Each Thread has a private field threadLocals, which actually stores the thread-local values.
Each key in this map is a w...
JSON serialization of Google App Engine models
...add=True)
album = db.ReferenceProperty(Album, collection_name='photo')
from django.utils import simplejson
from google.appengine.ext import webapp
class PhotoHandler(webapp.RequestHandler):
def get(self):
photos = Photo.all()
self.response.out.write(simplejson.dumps([p.to_dict() ...
Count the number of commits on a Git branch
... of commits on branch in git
but that assumes that the branch was created from master.
12 Answers
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lexers vs parsers
...at parsers and lexers have in common:
They read symbols of some alphabet from their input.
Hint: The alphabet doesn't necessarily have to be of letters. But it
has to be of symbols which are atomic for the language
understood by parser/lexer.
Symbols for the lexer: ASCII characters.
Symbols for ...