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JavaScript null check
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@bfavaretto: Yep, so it might actually be a typo. But you never know… :D
– Ry-♦
May 21 '13 at 14:42
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Why can I use auto on a private type?
...e itself is still usable, which is why you can return it to client code at all.
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What are the most-used vim commands/keypresses?
...rouble wading through the gargantuan lists of things you can do in VIM and all of the keypresses for them. I'm tired of hearing "You can use 'I' for inserting text, or 'a' for appending text after the character, or 'A' for appending text at the end of the line, or…" I can't imagine everyone uses a...
Shell equality operators (=, ==, -eq)
...nd many other shells) adopted. That's the whole point -- if you have [[ at all, then you can safely assume that all the extensions ksh implemented around it (fnmatch()-style pattern matching, ERE regular expressions with =~, and yes, suppression of string-splitting and filesystem globbing) will be a...
How to do a JUnit assert on a message in a logger
I have some code-under-test that calls on a Java logger to report its status.
In the JUnit test code, I would like to verify that the correct log entry was made in this logger. Something along the following lines:
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Remove element of a regular array
...n foos.ToArray();
You could try this extension method that I haven't actually tested:
public static T[] RemoveAt<T>(this T[] source, int index)
{
T[] dest = new T[source.Length - 1];
if( index > 0 )
Array.Copy(source, 0, dest, 0, index);
if( index < source.Length ...
Why can't we have static method in a (non-static) inner class?
... would be 'annoying as a mothertrucker'. Don't understand why Java doesn't allow for this. Sometimes, I want an inner class to use properties of the parent class, but keep static methods for better namespacing. Is there something inherently wrong with this? :(
– Angad
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What is the fastest way to compare two sets in Java?
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firstSet.equals(secondSet)
It really depends on what you want to do in the comparison logic... ie what happens if you find an element in one set not in the other? Your method has a void return type so I assume you'll do the necessary work in this method.
M...
Ruby on Rails: how do I sort with two columns using ActiveRecord?
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Assuming you're using MySQL,
Model.all(:order => 'DATE(updated_at), price')
Note the distinction from the other answers. The updated_at column will be a full timestamp, so if you want to sort based on the day it was updated, you need to use a function to ...
Is R's apply family more than syntactic sugar?
...tem elapsed
7.52 0.00 7.58
Edit 2:
Regarding the usage of parallel packages for R (e.g. rpvm, rmpi, snow), these do generally provide apply family functions (even the foreach package is essentially equivalent, despite the name). Here's a simple example of the sapply function in snow:
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