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Simultaneously merge multiple data.frames in a list
...e all columns, we can use select helpers from tidyselect and
choose (as we start from .x all .x columns are kept):
eat(x, list(y,z), starts_with("l") ,.by = "i")
# # A tibble: 3 x 3
# i j l
# <chr> <int> <int>
# 1 a 1 9
# 2 b 2 NA
# 3 c ...
How to call asynchronous method from synchronous method in C#?
...then you'll deadlock even with the nested context. In that case, you could start the async method on the thread pool:
var task = Task.Run(async () => await MyAsyncMethod());
var result = task.WaitAndUnwrapException();
However, this solution requires a MyAsyncMethod that will work in the thread p...
Push Notifications in Android Platform
...ion - Does Android support near real time push notification? )
I recently started playing with MQTT http://mqtt.org for Android as a way of doing this sort of thing (i.e. push notification that is not SMS but data driven, almost immediate message delivery, not polling, etc.)
I have a blog post wit...
Is it possible to run selenium (Firefox) web driver without a GUI?
...
Yes. You can use HTMLUnitDriver instead for FirefoxDriver while starting webdriver. This is headless browser setup. Details can be found here.
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HTML5shiv vs Dean Edwards IE7-js vs Modernizr - which to choose?
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Easiest way to start a new HTML5 project is using initializr. It will guide and let you build, download your HTML5 project files.
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Read file from line 2 or skip header row
How can I skip the header row and start reading a file from line2?
8 Answers
8
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SQL order string as number
...s' | 123
'$123' | 0 /* the left side of the string does not start with a number */
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serve current directory from command line
...rt => 9090, :DocumentRoot => Dir.pwd); trap('INT') { s.shutdown }; s.start"
Even the first command is hard to remember, so I just have this in my .bashrc:
function serve {
port="${1:-3000}"
ruby -run -e httpd . -p $port
}
It serves the current directory on port 3000 by default, but ...
Where should I put the log4j.properties file?
...ct
src
MyClass.java
log4j.properties
If you start executing from a different project, you need to have that file in the project used for starting the execution. For example, if a different project holds some JUnit tests, it needs to have also its log4j.properties file....
Vim: Replacing a line with another one yanked before
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Move to the start of the first line.
y, $ – copy the line without the linebreak at the end
Move to the start of the target line.
V, p – replace just one target line
c, c, Ctrlr, 0, Esc