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Is there a “previous sibling” selector?
...g the element comes after this one, but not necessarily immediately after) and is a CSS3 selector. + is for next sibling and is CSS2.1.
See Adjacent sibling combinator from Selectors Level 3 and 5.7 Adjacent sibling selectors from Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification.
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Which is more efficient, a for-each loop, or an iterator?
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If you are just wandering over the collection to read all of the values, then there is no difference between using an iterator or the new for loop syntax, as the new syntax just uses the iterator underwater.
If however, you mean by loop the ...
When to use virtual destructors?
I have a solid understanding of most OOP theory but the one thing that confuses me a lot is virtual destructors.
17 Answe...
Set a default parameter value for a JavaScript function
...ments which I set a default on, which get used if the value isn't defined (and ignored if the value is passed). In Ruby you can do it like this:
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How do I find the time difference between two datetime objects in python?
...nly holds the difference.
In the example above it is 0 minutes, 8 seconds and 562000 microseconds.
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Validate phone number with JavaScript
I found this code in some website, and it works perfectly. It validates that the phone number is in one of these formats:
(123) 456-7890 or 123-456-7890
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CSS to stop text wrapping under image
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Since this question is gaining lots of views and this was the accepted answer, I felt the need to add the following disclaimer:
This answer was specific to the OP's question (Which had the width set in the examples). While it works, it requires you to have a width ...
This type of CollectionView does not support changes to its SourceCollection from a thread different
...eCollection is created on UI thread, you can only modify it from UI thread and not from other threads. This is termed as thread affinity.
If you ever need to update objects created on UI thread from different thread, simply put the delegate on UI Dispatcher and that will do work for you delegating ...
Is there any reason to use a synchronous XMLHttpRequest?
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I think they might become more popular as HTML 5 standards progress. If a web application is given access to web workers, I could foresee developers using a dedicated web worker to make synchronous requests for, as Jonathan said, to ensure one request happens before another....
What's better at freeing memory with PHP: unset() or $var = null
...is garbage-collected.) (bug 33595)
The question "difference between unset and = null" details some differences:
unset($a) also removes $a from the symbol table; for example:
$a = str_repeat('hello world ', 100);
unset($a);
var_dump($a);
Outputs:
Notice: Undefined variable: a in xxx
NULL
But ...