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How to use redis PUBLISH/SUBSCRIBE with nodejs to notify clients when data values change?
...uses express, socket.io, node_redis and last but not least the sample code from media fire.
Install node.js+npm(as non root)
First you should(if you have not done this yet) install node.js+npm in 30 seconds (the right way because you should NOT run npm as root):
echo 'export PATH=$HOME/local/bin:...
Python: using a recursive algorithm as a generator
... In Python 3.4, you can replace the last two lines with yield from getPermutations(string[:i] + string[i+1:]), which is more efficient in many ways!
– Manuel Ebert
Apr 29 '14 at 17:46
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What is the difference between named and positional parameters in Dart?
... parameters are referenced by name, they can be used in an order different from their declaration.
getHttpUrl('example.com', '/index.html');
getHttpUrl('example.com', '/index.html', port: 8080);
getHttpUrl('example.com', '/index.html', port: 8080, numRetries: 5);
getHttpUrl('example.com', '/index.h...
Force browser to clear cache
...use no-store instead. This directive is not effective in preventing caches from storing your response." But when I searched this page for "no-store", it seems nobody mentioned it. I must be misunderstanding something, what is it?
– Matt Groth
Jun 27 at 5:08
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List comprehension vs map
...ust to iterate. The same argument holds for filter and reduce and anything from the itertools module: if you already have a function handy, you could go ahead and do some functional programming. This gains readability in some situations, and loses it in others (e.g. novice programmers, multiple argu...
What is Normalisation (or Normalization)?
...r, leading to data corruption.
There is a number of normalization levels from 1. normal form through 5. normal form. Each normal form describes how to get rid of some specific problem, usually related to redundancy.
Some typical normalization errors:
(1) Having more than one value in a cell. Exa...
What's the cause of this FatalExecutionEngineError in .NET 4.5 beta? [closed]
...lieve I have found as good an explanation as we will find without somebody from the .NET JIT team answering.
UPDATE
I looked a little deeper, and I believe I have found the source of the issue. It appears to be caused by a combination of a bug in the JIT type-initialization logic, and a change in...
Using os.walk() to recursively traverse directories in Python
I want to navigate from the root directory to all other directories within and print the same.
13 Answers
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Heap vs Binary Search Tree (BST)
... new elements are almost certain to go at the bottom
heap insertion starts from the bottom, BST must start from the top
In a binary heap, increasing the value at a given index is also O(1) for the same reason. But if you want to do that, it is likely that you will want to keep an extra index up-to...
$(document).ready equivalent without jQuery
...e a script that uses $(document).ready , but it doesn't use anything else from jQuery. I'd like to lighten it up by removing the jQuery dependency.
...