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IN vs OR in the SQL WHERE Clause
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I assume you want to know the performance difference between the following:
WHERE foo IN ('a', 'b', 'c')
WHERE foo = 'a' OR foo = 'b' OR foo = 'c'
According to the manual for MySQL if the values are constant IN sorts the list and then uses a binary search. I would imagine that OR evaluates t...
Why doesn't Objective-C support private methods?
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Private methods could not bypass the message dispatch. Consider the following scenario:
A class AllPublic has a public instance method doSomething
Another class HasPrivate has a private instance method also called doSomething
You create an array containing any number of instances of both AllPubl...
Pretty-print C++ STL containers
...print" function to use on the item instead of just outputting it direct. A bit like STL algorithms allow you to pass in custom predicates. With map you would use it this way, with a custom printer for the std::pair.
Your "default" printer would just output it to the stream.
Ok, let's work on a cus...
Iterate over object keys in node.js
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Thanks !, this improves my iterator a bit :) (updated the code) but sadly the memory issue remains :( And i can not use forEach since each iteration step should be invoked from an async setTimeout.
– stewe
Sep 16 '11 at 8:41...
How can you find the height of text on an HTML canvas?
...example of this working, I used this technique in the Carota editor.
Following on from ellisbben's answer, here is an enhanced version to get the ascent and descent from the baseline, i.e. same as tmAscent and tmDescent returned by Win32's GetTextMetric API. This is needed if you want to do a word-...
“Content is not allowed in prolog” when parsing perfectly valid XML on GAE
...th "Message: <?xml version...." The problem was the text before the xml bit. Thanks :)
– Ric Jafe
Feb 20 '13 at 14:48
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Get Enum from Description attribute [duplicate]
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yes it's getting the right enum type that I'm a bit stuck on.
– fearofawhackplanet
Dec 6 '10 at 15:17
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Python function global variables?
.... If you only want to access it, then you don't need global.
To go into a bit more detail on that, what "modify" means is this: if you want to re-bind the global name so it points to a different object, the name must be declared global in the function.
Many operations that modify (mutate) an objec...
How to find what code is run by a button or element in Chrome using Developer Tools
...stacked, and you may not know which one triggers the code.
If this is a bit out of your knowledge, take a look at Chrome's tutorial on debugging.
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How To Check If A Key in **kwargs Exists?
... pass through *args and **kwargs you make your code slower, and requires a bit more typing, but if interfaces of the called function (in this case print) changes, you don't need to change your code. This approach reduces development time while supporting all interface changes.
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