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Uniq by object attribute in Ruby
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Do it on the database level:
YourModel.find(:all, :group => "status")
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What is the fastest integer division supporting division by zero no matter what the result is?
...x, int y)
{
y += y == 0;
return x/y;
}
The compiler basically recognizes that it can use a condition flag of the test in the addition.
As per request the assembly:
.globl f
.type f, @function
f:
pushl %ebp
xorl %eax, %eax
movl %esp, %ebp
movl 12(%...
How to get string objects instead of Unicode from JSON?
...unicode strings, then recurses through the entire decoded value to convert all strings to byte strings. This has a couple of undesirable effects:
A copy of the entire decoded structure gets created in memory
If your JSON object is really deeply nested (500 levels or more) then you'll hit Python's ...
Reading Xml with XmlReader in C#
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My experience of XmlReader is that it's very easy to accidentally read too much. I know you've said you want to read it as quickly as possible, but have you tried using a DOM model instead? I've found that LINQ to XML makes XML work much much easier.
If your document is particularly h...
Check if full path given
..., and Namespaces --> Fully Qualified vs. Relative Paths
For Windows API functions that manipulate files, file names can often
be relative to the current directory, while some APIs require a fully
qualified path. A file name is relative to the current directory if it
does not begin with ...
Linux的诞生和发展 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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POSIX.1 仅规定了系统服务应用程序编程接口（API），仅概括了基本的系统服务标准，因此期望对系统的其它功能也制定出标准。这样IEEE POSIX 的工作就开始展开了。在1990 年，刚开始有十个批准的计划在进行，有近300 ...
How to get the currently logged in user's user id in Django?
...rs = [{user.id: user.get_name()} for user in logged_in_users]
# Query all logged in staff users based on id list
all_staff_users = CustomUser.objects.filter(is_resident=False, is_active=True, is_superuser=False)
logged_out_users = list()
# for some reason exclude() would not work co...
Preferred method to store PHP arrays (json_encode vs serialize)
...ciative array of data in a flat file for caching purposes. I might occasionally come across the need to convert it to JSON for use in my web app but the vast majority of the time I will be using the array directly in PHP.
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How do I detect IE 8 with jQuery?
...owser.version.substring(0, 2) == "8.") { ... }. That way it will work with all versions of IE8.
– AndiDog
Feb 4 '10 at 19:10
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Coding Practices which enable the compiler/optimizer to make a faster program
...act.
Expect to be disappointed and to have to work very hard indeed for small performance improvements. Modern compilers for mature languages such as Fortran and C are very, very good. If you read an account of a 'trick' to get better performance out of code, bear in mind that the compiler writer...