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Maven: how to do parallel builds?
...are great, but I wanted to add something to the answers here regarding the test stability during parallel builds.
So, when Maven parallel build is used:
mvn -T 4 clean install # Builds with 4 threads
mvn -T 1C clean install # 1 thread per cpu core
mvn -T 1.5C clean install # 1.5 thread per cpu core
...
How do I make a simple makefile for gcc on Linux?
...
The simplest make file can be
all : test
test : test.o
gcc -o test test.o
test.o : test.c
gcc -c test.c
clean :
rm test *.o
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How do I test if a string is empty in Objective-C?
How do I test if an NSString is empty in Objective-C?
30 Answers
30
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Check if a Bash array contains a value
In Bash, what is the simplest way to test if an array contains a certain value?
35 Answers
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The forked VM terminated without saying properly goodbye. VM crash or System.exit called
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Don't forget error stream too: mvn clean test 2>err.txt 1>out.txt or mvn clean test > out.txt 2>&1 or mvn clean test 2>&1 | tee out.txt While redirecting, you can watch output in other console with less +F out.txt
– radzi...
How to redirect to a 404 in Rails?
...gly conditional statements.
As a bonus, it's also super easy to handle in tests. For example, in an rspec integration test:
# RSpec 1
lambda {
visit '/something/you/want/to/404'
}.should raise_error(ActionController::RoutingError)
# RSpec 2+
expect {
get '/something/you/want/to/404'
}.to r...
Retrieve only the queried element in an object array in MongoDB collection
... returned document to contain only the first matched shapes element:
db.test.find(
{"shapes.color": "red"},
{_id: 0, shapes: {$elemMatch: {color: "red"}}});
Returns:
{"shapes" : [{"shape": "circle", "color": "red"}]}
In 2.2 you can also do this using the $ projection operator, where...
“Diff” an image using ImageMagick
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Here's a script to visually diff two PDFs page-by-page using this method: gist.github.com/brechtm/891de9f72516c1b2cbc1. It outputs one JPG for each page of the PDFs in a pdfdiff directory and additionally prints the numbers of the pag...
Measuring the distance between two coordinates in PHP
...ons possible, this version implements the formula in Wikipedia and is well tested. The $angle means the angle in the middle of the world in radians, so one can multiplicate it with the earth radius. I can also provide an example of the more complex Vincenty formula if someone is interested.
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Rename a dictionary key
...or python 3.5, I think dict.pop is workable for an OrderedDict based on my test.
– Daniel
Dec 5 '17 at 13:30
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