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Get a random item from a JavaScript array [duplicate]
... not a valid substitution for Math.floor. Using round would cause accidentally referencing an undefined index, say in the case Math.random() is 0.95 and items.length is 5. Math.round(0.95*5) is 5, which would be an invalid index. floor(random) will always be zero in your example.
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Valid content-type for XML, HTML and XHTML documents
...st for registered media types ending in +xml.
(For unregistered x- types, all bets are off, but you'd hope +xml would be respected.)
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A Java API to generate Java source files [closed]
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Sun provides an API called CodeModel for generating Java source files using an API. It's not the easiest thing to get information on, but it's there and it works extremely well.
The easiest way to get hold of it is as part of the JAXB 2 RI - th...
How to check if a file exists in Go?
... You could use os.IsExist() depending the case, could be more idiomatically instead of making a double negation when doing !os.IsNotExistant()
– Ariel Monaco
Feb 17 at 3:18
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Microsoft Excel mangles Diacritics in .csv files?
I am programmatically exporting data (using PHP 5.2) into a .csv test file.
Example data: Numéro 1 (note the accented e).
The data is utf-8 (no prepended BOM).
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What is sharding and why is it important?
... be possible to infer the appropriate shard membership easily and automatically, and query only the relevant shard.
Some more information about sharding:
Firstly, each database server is identical, having the same table structure. Secondly, the data records are logically split up in a sharded ...
Django templates: verbose version of a choice
... (universal), though - unless you know a way to iterate in a template over all get_FOO_display methods of a model object :) I'm a bit too lazy for writing non-generic templates ;) Moreover, the docs say it's a model instance's method. Therefore it'd have to be a model form bound to an existing obj...
Programmatically stop execution of python script? [duplicate]
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You could raise SystemExit(0) instead of going to all the trouble to import sys; sys.exit(0).
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Calling filter returns [duplicate]
...ten) want to do the filtering in a lazy sense -- You don't need to consume all of the memory to create a list up front, as long as the iterator returns the same thing a list would during iteration.
If you're familiar with list comprehensions and generator expressions, the above filter is now (alm...
ATL CComPtr和CComQIPtr详解 - C/C++ - 清泛网 - 专注IT技能提升
...ance(REFCLSID rclsid,LPUNKNOWN pUnkOuter=NULL, DWORD dwClsCOntext=CLSCTX_ALL);
HRESULT CoCreateInstance(LPCOLESTR szProgID, LPUNKNOSWN pUnkOuter=NULL, DWORD dwClsContxt=CLSCTX_ALL);
后两个参数不管，第一个参数要不传入CLSID,要不传入字符串形式的progID.
例子代码如...