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What is the difference between 'my' and 'our' in Perl?
...ariables. You can see that in the following program: package Foo; our $x = 123; package Bar; say $x;. If you want to "declare" a package variable, you need to use use vars qw( $x );. our $x; declares a lexically-scoped variable that is aliased to the same-named variable in the package in which the o...
How to detect online/offline event cross-browser?
...er vendors update the navigator.onLine flag when actual network access is lost, others don't.
From the spec:
Returns false if the user agent is
definitely offline (disconnected from
the network). Returns true if the user
agent might be online.
The events online and offline are
fired when the value ...
Installing Apple's Network Link Conditioner Tool
... Just double-click the Network Link Conditioner.prefpane and OS X will install it for you. (System Preferences will pop up and ask you about it.)
– Kurt Revis
May 11 '12 at 3:52
...
StringUtils 字符串工具扩展：强大的文本处理工具集 · App Inventor 2 中文网
...本填充
// 左填充到10位
设置 StringUtils1.Text 为 "123"
设置 Label1.Text 为 调用 StringUtils1.LeftPad(10, "0")
// 结果: "0000000123"
// 居中对齐
设置 StringUtils1.Text 为 "Hi"
设置 Label2.Text 为 调用 StringUtils1.Center(10, "*")
// 结果: "****Hi****"
...
What is the difference between SQL, PL-SQL and T-SQL?
...guage to operate on sets.
It is more or less standardized, and used by almost all relational database management systems: SQL Server, Oracle, MySQL, PostgreSQL, DB2, Informix, etc.
PL/SQL is a proprietary procedural language used by Oracle
PL/pgSQL is a procedural language used by PostgreSQL
TSQL i...
Browser detection in JavaScript? [duplicate]
...F 3's issue with not sending the Content-Length header for read-only AJAX POST messages), feature support just doesn't cut it.
– Cobra
Jun 12 '13 at 16:04
...
What is the best way to programmatically detect porn images? [closed]
...ones - and porn images tend to have a lot of skin. This will create false positives but if this is a problem you can pass images so detected through actual moderation. This not only greatly reduces the the work for moderators but also gives you lots of free porn. It's win-win.
#!python
import o...
Reorder levels of a factor without changing order of values
... relevant difference between the datasets.
– CoderGuy123
Dec 27 '15 at 21:49
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How to do constructor chaining in C#
... {
}
}
then:
Foo a = new Foo(), b = new Foo(456,"def"), c = new Foo(123), d = new Foo("abc");
Note also:
you can chain to constructors on the base-type using base(...)
you can put extra code into each constructor
the default (if you don't specify anything) is base()
For "why?":
code r...
HTML colspan in CSS
...>
<div class="item-c">3</div>
<div class="item-d">123</div>
</div>
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