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Is if(items != null) superfluous before foreach(T item in items)?
I often come across code like the following:
12 Answers
12
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What's the fastest way to convert String to Number in JavaScript?
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@beatak - Current optimizations seem to favor native methods as opposed to implicit conversion. I'm getting fastest for Number() in Chrome 37.0.2062.124 on Windows Server 2008 R2 / 7 and ParseInt() in Firefox 30.0 with implicit being the slowest for both. Also, you might cons...
Further understanding setRetainInstance(true)
What exactly happens when you call setRetainInstance(true) on a Fragment ? The documentation is virtually non-existent and this seems like a very important function. Specifically I want to know how much of this sequence (that I made up) is true:
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What is the difference between Server.MapPath and HostingEnvironment.MapPath?
Is there any difference between Server.MapPath() and HostingEnvironment.MapPath() ? Does Server.MapPath() have any advantages over HostingEnvironment.MapPath() ?
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Iterating through a range of dates in Python
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Why are there two nested iterations? For me it produces the same list of data with only one iteration:
for single_date in (start_date + timedelta(n) for n in range(day_count)):
print ...
And no list gets stored, only one generator is iterated over. Also the "if...
retrieve links from web page using python and BeautifulSoup [closed]
...er
http = httplib2.Http()
status, response = http.request('http://www.nytimes.com')
for link in BeautifulSoup(response, parse_only=SoupStrainer('a')):
if link.has_attr('href'):
print(link['href'])
The BeautifulSoup documentation is actually quite good, and covers a number of typical s...
Emacs bulk indent for Python
...es to the left
If you need to shift code by two levels of indention, or some arbitary amount you can prefix the command with an argument:
C-u 8 C-c > shifts the region 8 spaces to the right
C-u 8 C-c < shifts the region 8 spaces to the left
Another alternative is to use M-x indent-...
Get difference between two lists
... you do want set([1, 3]) as your answer, you'll need to use set([1, 2]).symmetric_difference(set([2, 3])).
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Create subdomains on the fly with .htaccess (PHP)
...directive. An example vhost container:
<VirtualHost *:80>
ServerName server.example.org
ServerAlias *.example.org
UseCanonicalName Off
</VirtualHost>
3. Work out which subdomain you are on in PHP
Then in your PHP scripts you can find out the domain by looking in the $_SERVER su...