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How to listen for changes to a MongoDB collection?
...I need to poll every few seconds to see if there are any changes from last time, or is there a way my script can wait for inserts to occur? This is a PHP project that I am working on, but feel free to answer in Ruby or language agnostic.
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Are inline virtual functions really a non-sense?
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Virtual functions can be inlined sometimes. An excerpt from the excellent C++ faq:
"The only time an inline virtual call
can be inlined is when the compiler
knows the "exact class" of the object
which is the target of the virtual
function call. This ...
The best way to remove duplicate values from NSMutableArray in Objective-C?
...e: in Jim's) doesn't scale well for large arrays. Those checks run in O(N) time, meaning that if you double the size of the original array then each check will take twice as long to run. Since you're doing the check for each object in the array, you'll also be running more of those more expensive ch...
Understanding the basics of Git and GitHub [closed]
...ade especially for Git.
How does Git compare to a backup system such as Time Machine?
It's a different thing, Git lets you track changes and your development process. If you use Git with GitHub, it becomes effectively a backup. However usually you would not push all the time to GitHub, at which...
Having both a Created and Last Updated timestamp columns in MySQL 4.0
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From the MySQL 5.5 documentation:
One TIMESTAMP column in a table can have the current timestamp as the default value for initializing the column, as the auto-update value, or both. It is not possible to have the current timestamp be the default value for one col...
How to print a debug log?
...this is the most convenient solution. Xdebug is to heavy to run it all the time. Voted for you
– Phung D. An
Dec 23 '14 at 15:57
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Sorting a vector in descending order
...ethod takes around 4 seconds, while using the second takes about twice the time. That says something, obviously, but I don't understand why either. Just think this would be helpful.
Same thing reported here.
As said by Xeo, with -O3 they use about the same time to finish.
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How to pause / sleep thread or process in Android?
...droid that you want a bit of code to be executed after a certain amount of time has passed.
– tronman
Feb 16 '12 at 19:45
27
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Operator precedence with Javascript Ternary operator
...so make sure you don't bother with the concatenation of values at the same time as doing your ternary operation:
h.className = h.className + (h.className ? ' error' : 'error');
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How to clear the canvas for redrawing
... this performance difference be irrelevant.
100000 iterations averaged 10 times:
1885ms to clear
2112ms to reset and clear
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