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When to use symbols instead of strings in Ruby?
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TL;DR
A simple rule of thumb is to use symbols every time you need internal identifiers. For Ruby < 2.2 only use symbols when they aren't generated dynamically, to avoid memory leaks.
Full answer
The only reason not to use them for identifiers that ...
How does Go compile so quickly?
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Dependency analysis.
The Go FAQ used to contain the following sentence:
Go provides a model for software
construction that makes dependency
analysis easy and avoids much of the
overhead of C-style include files and
libraries.
W...
$(document).click() not working correctly on iPhone. jquery [duplicate]
This function works perfectly on IE, Firefox and Chrome but when on the iPhone, it will only work when clicking on a <img> . Clicking on the page (anywhere but on a img) wont fire the event.
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How do I properly clean up Excel interop objects?
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Excel does not quit because your application is still holding references to COM objects.
I guess you're invoking at least one member of a COM object without assigning it to a variable.
For me it was the excelApp.Worksheets object which I directly used without assignin...
How to catch integer(0)?
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That is R's way of printing a zero length vector (an integer one), so you could test for a being of length 0:
R> length(a)
[1] 0
It might be worth rethinking the strategy you are using to identify which elements you want, bu...
MySQL: Fastest way to count number of rows
...takes in count column indexes, so it will be the best result. Mysql with MyISAM engine actually stores row count, it doensn't count all rows each time you try to count all rows. (based on primary key's column)
Using PHP to count rows is not very smart, because you have to send data from mysql to ph...
Are global variables in PHP considered bad practice? If so, why?
...riable that contains the system configuration, and when I nead to access this variable in a function, I do global $var; .
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CORS - What is the motivation behind introducing preflight requests?
Cross-origin resource sharing is a mechanism that allows a web page to make XMLHttpRequests to another domain (from wikipedia ).
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Concept behind these four lines of tricky C code
Why does this code give the output C++Sucks ? What is the concept behind it?
9 Answers
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Hidden features of mod_rewrite
...s the rules are processed once, as opposed to each time the .htaccess file is called).
Logging mod_rewrite requests
Logging may be enabled from within the httpd.conf file (including <Virtual Host>):
# logs can't be enabled from .htaccess
# loglevel > 2 is really spammy!
RewriteLog /path/...