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What's the $unwind operator in MongoDB?
...hat it stores your data is in the form of documents and collections, which allows for a dynamic means of adding and obtaining the data from your storage locations.
That being said, in order to understand the concept behind the $unwind parameter, you first must understand what the use case that you ...
JRE 1.7 - java version - returns: java/lang/NoClassDefFoundError: java/lang/Object
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This problem stems from an improper Java installation.
Possibility 1
NOTE: This scenario only applies to Java 8 and prior. Beginning with Java 9, the JRE is structured differently. rt.jar and friends no longer exist, and Pack200 is no longer used.
The Java standa...
python NameError: global name '__file__' is not defined
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I had the same problem with PyInstaller and Py2exe so I came across the resolution on the FAQ from cx-freeze.
When using your script from the console or as an application, the functions hereunder will deliver you the "execution path", not the "actual file pa...
When to use actors instead of messaging solutions such as WebSphere MQ or Tibco Rendezvous?
...quire casting due to Scala's type system.
Also in Java people don't typically make immutable objects which I recommend you do for messaging. Consequently its very easy in Java to accidentally do something using Akka that will not scale (using mutable objects for messages, relying on weird closure ...
Proper way to declare custom exceptions in modern Python?
...tionError(Exception):
def __init__(self, message, errors):
# Call the base class constructor with the parameters it needs
super(ValidationError, self).__init__(message)
# Now for your custom code...
self.errors = errors
That way you could pass dict of error me...
A proper wrapper for console.log with correct line number?
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This is an old question and All the answers provided are overly hackey, have MAJOR cross browser issues, and don't provide anything super useful. This solution works in every browser and reports all console data exactly as it should. No hacks required...
Algorithm to detect corners of paper sheet in photo
...n are awesome, move to them as soon as possible. :D
Instead of removing small objects and or noise, lower the canny restraints, so it accepts more edges, and then find the largest closed contour (in OpenCV use findcontour() with some simple parameters, I think I used CV_RETR_LIST). might still stru...
How do I call some blocking method with a timeout in Java?
...use the timeout version of get().
See http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/FutureTask.html
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When is a function too long? [closed]
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There's no real hard and fast rules for it. Generally I like my methods to just "do one thing". So if it's grabbing data, then doing something with that data, then writing it to disk then I'd split out the grabbing and writing into separate methods so my "main" method just ...
How to remove all listeners in an element? [duplicate]
...at the fastest way to do this is to just clone the node, which will remove all event listeners:
var old_element = document.getElementById("btn");
var new_element = old_element.cloneNode(true);
old_element.parentNode.replaceChild(new_element, old_element);
Just be careful, as this will also clear ...