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Reading header data in Ruby on Rails
..."Cookie"]
New way:
request.headers["HTTP_COOKIE"]
To get a Hash with all headers of the request.
request.headers
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In Perl, how can I read an entire file into a string?
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before reading from the file handle. See How can I read in an entire file all at once?, or
$ perldoc -q "entire file"
See Variables related to filehandles in perldoc perlvar and perldoc -f local.
Incidentally, if you can put your script on the server, you can have all the modules you want. See ...
Where and why do I have to put the “template” and “typename” keywords?
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(See here also for my C++11 answer)
In order to parse a C++ program, the compiler needs to know whether certain names are types or not. The following example demonstrates that:
t * f;
How should this be parsed? For many languages a compiler doesn't need to know...
Returning value from called function in a shell script
I want to return the value from a function called in a shell script. Perhaps I am missing the syntax. I tried using the global variables. But that is also not working. The code is:
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How to check Google Play services version?
...ion
(declared in AndroidManifest.xml android:versionCode)
in order to be compatible with this client version.
Constant Value: 3225000 (0x003135a8)
So, when you set that in your manifest and then call isGooglePlayServicesAvailable(context):
public static int isGooglePlayServic...
What is the equivalent of MATLAB's repmat in NumPy
...n no longer assert that repmat and tile are equivalent instructions.
In order to get tile to behave like repmat, in Python one has to make sure that the input matrix has as many dimensions as the elements are in the sequence. This is done, for example, by a little preconditioning and creating a r...
Remove rows with duplicate indices (Pandas DataFrame and TimeSeries)
...Pandas Index itself:
df3 = df3[~df3.index.duplicated(keep='first')]
While all the other methods work, the currently accepted answer is by far the least performant for the provided example. Furthermore, while the groupby method is only slightly less performant, I find the duplicated method to be mor...
How to test that no exception is thrown?
... test your functionality: if an exception is thrown the test will automatically fail. If no exception is thrown, your tests will all turn up green.
I have noticed this question garners interest from time to time so I'll expand a little.
Background to unit testing
When you're unit testing it's imp...
Is volatile expensive?
...ation on x86, and is as fast as a normal variable read (disregarding the reordering constraints of volatile)?
4 Answers
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Where is array's length property defined?
...uage itself.
10.7. Array Members
The members of an array type are all of the following:
The public final field length, which contains the number of components of the array. length may be positive or zero.
The public method clone, which overrides the method of the same name in clas...