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What is the difference between static func and class func in Swift?
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Is it simply that static is for static functions of structs and enums, and class for classes and protocols?
That's the main difference. Some other differences are that class functions are dynamically dispatched and can be o...
C# using streams
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A stream is an object used to transfer data. There is a generic stream class System.IO.Stream, from which all other stream classes in .NET are derived. The Stream class deals with bytes.
The concrete stream classes are used to deal w...
GetType() can lie?
...the following question asked a few days ago in SO: GetType() and polymorphism and reading Eric Lippert's answer, I started thinking if making GetType() not be virtual really ensured that an object could not lie about its Type .
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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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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...
How do I write a bash script to restart a process if it dies?
...g else that tries to evaluate processes that aren't their children.
There is a very good reason why in UNIX, you can ONLY wait on your children. Any method (ps parsing, pgrep, storing a PID, ...) that tries to work around that is flawed and has gaping holes in it. Just say no.
Instead you need t...
Why does Unicorn need to be deployed together with Nginx?
...ow the difference between Nginx and Unicorn. As far as I understand, Nginx is a web server while Unicorn is a Ruby HTTP server.
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Storing JSON in database vs. having a new column for each key
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Updated 4 June 2017
Given that this question/answer have gained some popularity, I figured it was worth an update.
When this question was originally posted, MySQL had no support for JSON data types and the support in PostgreSQL was in its infancy. Since 5.7...
jQuery SVG vs. Raphael [closed]
...ples and Demos. Very extensible architecture. Great with animation.
Cons: is a layer over the actual SVG markup, makes it difficult to do more complex things with SVG - such as grouping (it supports Sets, but not groups). Doesn't do great w/ editing of already existing elements.
jQuery SVG
Pros: ...
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/...