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Get type of all variables
...und trip casts/coercions that occur when assigning and reading data to and from disk.
Ideology around R's triad typing system:
R's duck typing system has uncertainty in it. As an analogy, consider a ceramic cup, it can be used to hold a liquid, or used as a projectile like a baseball. The purpos...
Disable a Maven plugin defined in a parent POM
...nterested.
The shortest form I found is further improvement on the example from λlex and bmargulies. The execution tag will look like:
<execution>
<id>TheNameOfTheRelevantExecution</id>
<phase/>
</execution>
2 points I want to highlight:
phase is set to no...
How to get svn remote repository URL?
...ome information about the current working copy, including the remote URL.
From the manual, an example output is:
$ svn info foo.c
Path: foo.c
Name: foo.c
URL: http://svn.red-bean.com/repos/test/foo.c
Repository Root: http://svn.red-bean.com/repos/test
Repository UUID: 5e7d134a-54fb-0310-...
How do you discover model attributes in Rails?
...nt?
object.attributes
For instance methods without inheritance from super class
Model.instance_methods(false)
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How to convert a ruby hash object to JSON?
...ndefined method `to_json' for {:make=>"bmw", :year=>"2003"}:Hash
# from (irb):11
# from /usr/bin/irb:12:in `<main>'
require 'json'
# => true
car.to_json
# => "{"make":"bmw","year":"2003"}"
As you can see, requiring json has magically brought method to_json to our Hash.
...
Which is faster: while(1) or while(2)?
...? Or is this a clue that I'm reading generated code? Is it a bug resulting from an ill-advised find-and-replace-all, or a bad merge, or a cosmic ray? Maybe this line of code is supposed to do something dramatically different. Maybe it was supposed to read while(w) or while(x2). I'd better find the a...
Get the name of the currently executing method
...
From http://snippets.dzone.com/posts/show/2785:
module Kernel
private
def this_method_name
caller[0] =~ /`([^']*)'/ and $1
end
end
class Foo
def test_method
this_method_name
end
end
puts Foo.new.test_...
How do I append text to a file?
...
cat >> filename
This is text, perhaps pasted in from some other source.
Or else entered at the keyboard, doesn't matter.
^D
Essentially, you can dump any text you want into the file. CTRL-D sends an end-of-file signal, which terminates input and returns you to the shell...
The new keyword “auto”; When should it be used to declare a variable type? [duplicate]
...using something like a proxy type where you're depending on the conversion from proxy->target to do part of the job at hand, auto will (attempt to) create a target of the same type as the source so that conversion won't happen. In some cases, that may just delay the conversion, but in others it w...
When to use actors instead of messaging solutions such as WebSphere MQ or Tibco Rendezvous?
...aCamel you can abstract away the queue and produce/consume messages direct from an actor without any code to deal with the message queue message pushing/pulling.
You can forego akka-zeromq and use Akka directly with remoting.
I think akka-zeromq is being removed from the core library but we built a...