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What is the difference between Forking and Cloning on GitHub?
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Basically, yes. A fork is just a request for GitHub to clone the project and registers it under your username; GitHub also keeps track of the relationship between the two repositories, so you can visualize the commits and pulls between the two proj...
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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Is there a builtin identity function in python?
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Doing some more research, there is none, a feature was asked in issue 1673203 And from Raymond Hettinger said there won't be:
Better to let people write their own trivial pass-throughs
and think about the signature and time costs.
So a better way to...
StringUtils.isBlank() vs String.isEmpty()
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StringUtils.isBlank() checks that each character of the string is a whitespace character (or that the string is empty or that it's null). This is totally different than just checking if the string is empty.
From the linked documentation:...
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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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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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/...
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...
$(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 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...