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Is there a way to access method arguments in Ruby?
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In Ruby 1.9.2 and later you can use the parameters method on a method to get the list of parameters for that method. This will return a list of pairs indicating the name of the parameter and whether it is required.
e.g.
If you do
def foo(x, y)
end
then
method(:f...
Concatenate text files with Windows command line, dropping leading lines
I need to concatenate some relatively large text files, and would prefer to do this via the command line. Unfortunately I only have Windows, and cannot install new software.
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How do I get the logfile from an Android device?
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This commandline doesn't work for me, I get this output. logcat read: Invalid argument
– neoneye
Aug 24 '11 at 9:23
5
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How do you turn a Mongoose document into a plain object?
I have a document from a mongoose find that I want to extend before JSON encoding and sending out as a response. If I try adding properties to the doc it is ignored. The properties don't appear in Object.getOwnPropertyNames(doc) making a normal extend not possible. The strange thing is that JSON....
dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
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Since dplyr 0.8 group_by gained the .drop argument that does just what you asked for:
df = data.frame(a=rep(1:3,4), b=rep(1:2,6))
df$b = factor(df$b, levels=1:3)
df %>%
group_by(b, .drop=FALSE) %>%
summarise(count_a=length(a))
#> # A tibble: 3 x 2
#> ...
Shell one liner to prepend to a file
...nswer which worked and received lots of upvotes. Then, as the question became more popular and more time passed, outraged people started reporting that it sorta worked but weird things could happen, or it just didn't work at all, so it was furiously downvoted for a time. Such fun.
The solution exp...
Semi-transparent color layer over background-image?
...fine a width and height to the .background class, if there are no other elements inside of it
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How to increase the max upload file size in ASP.NET?
... it per page.
<configuration>
<system.web>
<httpRuntime maxRequestLength="xxx" />
</system.web>
</configuration>
"xxx" is in KB. The default is 4096 (= 4 MB).
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How do I generate a stream from a string?
I need to write a unit test for a method that takes a stream which comes from a text file. I would like to do do something like this:
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PostgreSQL database default location on Linux
..."database cluster", which is not related to distributed computing, it just means a group of databases and related objects managed by a PostgreSQL server.
The location of the data directory depends on the distribution. If you install from source, the default is /usr/local/pgsql/data:
In file sy...