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Why are variables “i” and “j” used for counters?
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It comes ultimately from mathematics: the summation notation traditionally uses i for the first index, j for the second, and so on. Example (from http://en.wikipedia.org/wiki/Summation):
It's also used that way for collections of things, like if you have a bunch of variables x1, x2, ......
Find the extension of a filename in Ruby
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That's really basic stuff:
irb(main):002:0> accepted_formats = [".txt", ".pdf"]
=> [".txt", ".pdf"]
irb(main):003:0> File.extname("example.pdf") # get the extension
=> ".pdf"
irb(main):004:0> accepted_formats.include? ...
Difference of Maven JAXB plugins
...om.sun.tools.xjc.maven2:maven-jaxb-plugin,
the development is active. Finally,
I'm one of the authors :) and I'd say
we keep in touch with JAXB developers
and users and react to the latests
features/requests.
And indeed, the plugin #2 isn't very active (dead?). And because I've always be...
What is the Ruby (spaceship) operator?
...irst language to use it. Groovy is another language that supports it. Basically instead of returning 1 (true) or 0 (false) depending on whether the arguments are equal or unequal, the spaceship operator will return 1, 0, or −1 depending on the value of the left argument relative to the right argum...
Setting focus on an HTML input box on page load
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Will that actually set the input focus? Which browser did you try it on?
– Peter Mortensen
Jul 1 '19 at 1:44
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Understanding the basics of Git and GitHub [closed]
...es and collaborate with other people.
Is Git saving every repository locally (in the user's machine) and in GitHub?
No, it's only local. You can decide to push (publish) some branches on GitHub.
Can you use Git without GitHub? If yes, what would be the benefit for using GitHub?
Yes, Git ru...
Having both a Created and Last Updated timestamp columns in MySQL 4.0
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Previously, at most one TIMESTAMP column per table could be automatically initialized or updated to the current date and time. This restriction has been lifted. Any TIMESTAMP column definition can have any combination of DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP clauses. In add...
Convert PHP closing tag into comment
...w this regex, I'd say: Hmmm, what's going on? But that is downright and totally subjective.
– ppeterka
Mar 5 '13 at 9:20
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How do I enable MSDTC on SQL Server?
... box.
Click the Security tab.
Check mark "Network DTC Access" checkbox.
Finally check mark "Allow Inbound" and "Allow Outbound" checkboxes.
Click Apply, OK.
A message will pop up about restarting the service.
Click OK and That's all.
Reference : https://msdn.microsoft.com/en-us/library/dd327979.as...
In C#, how to check if a TCP port is available?
In C# to use a TcpClient or generally to connect to a socket how can I first check if a certain port is free on my machine?
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