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eval command in Bash and its typical uses
...lue of the variable whose name is in this variable”, though:
echo ${!n}
one
$(…) runs the command specified inside the parentheses in a subshell (i.e. in a separate process that inherits all settings such as variable values from the current shell), and gathers its output. So echo $($n) runs $...
Any reason to clean up unused imports in Java, other than reducing clutter?
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One would be that if you remove the class referenced by the import from the classpath, you won't get a silly compiler error that served no purpose. And you won't get false positives when you perform a "where used" search.
An...
How to install MySQLdb (Python data access library to MySQL) on Mac OS X?
...ire 64-bit MySQL
First off, the author (still?) of MySQLdb says here that one of the most pernicious problems is that OS X comes installed with a 32 bit version of Python, but most average joes (myself included) probably jump to install the 64 bit version of MySQL. Bad move... remove the 64 bit ve...
Pythonic way to combine FOR loop and IF statement
...n and/or calling out to a well-named function. Trying to fit everything on one line is rarely "Pythonic".
Update following additional comments on your question and the accepted answer
I'm not sure what you are trying to do with enumerate, but if a is a dictionary, you probably want to use the ke...
How to test that no exception is thrown?
I know that one way to do it would be:
15 Answers
15
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Google Guava isNullOrEmpty for collections
... collection as soon as you can. If you just can't, then okay, you might be one of the <1% of users who really want to write their own trivial isNullOrEmpty(Collection) helper.
– Kevin Bourrillion
Mar 14 '12 at 17:25
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Adding external library in Android studio
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How can one do this WITHOUT copying? The library is used by other non-Android projects and is routinely updated. If it copies the source, then changes to the original will not be seen. Isn't that kind of stupid?
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In Java, how do I convert a byte array to a string of hex digits while keeping leading zeros? [dupli
I'm working with some example java code for making md5 hashes. One part converts the results from bytes to a string of hex digits:
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Difference in Months between two dates in JavaScript
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Nothing complicated with this one except the fact that every month started is counted. 31/03/2011 -> 01/05/2011 will be two months as well as 01/03/2011 -> 31/05/2011 but it should be three to be exact.
– Natim
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What is the significance of initializing direction arrays below with given values when developing ch
...ts directions instead of all adjacent directions. Here, ^1 will flip along one axis, ^4 will give the opposite knight leap.
.7.6.
0...5
..K..
1...4
.2.3.
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