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log4j logging hierarchy order
...n (at the end of the section) differs in treating OFF and ALL, well, after reading some of the source (not finding special cases) I doubt that their table is correct.
– Wolf
May 24 '18 at 9:58
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Jackson JSON custom serialization for certain fields
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Jackson-databind (at least 2.1.3) already contains special ToStringSerializer, see my answer.
– werupokz
Feb 14 '13 at 11:26
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Python subprocess.Popen “OSError: [Errno 12] Cannot allocate memory”
...erent instance on the same server as you running amock.
Memory-wise, we already know that subprocess.Popen uses fork/clone under the hood, meaning that every time you call it you're requesting once more as much memory as Python is already eating up, i.e. in the hundreds of additional MB, all in ord...
What does “./bin/www” do in Express 4.x?
...he start script in your package.json, heroku will automatically uses that, read more here
"scripts": {
"start": "node ./bin/www",
}
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Algorithm to return all combinations of k elements from n
...rs covering the topic:
An Efficient Implementation of the Eades, Hickey, Read Adjacent Interchange Combination Generation Algorithm (PDF, with code in Pascal)
Combination Generators
Survey of Combinatorial Gray Codes (PostScript)
An Algorithm for Gray Codes
Chase's Twiddle (algorithm)
Phillip J...
When should I use git pull --rebase?
...orks on it
Alice does git checkout master && git pull. Master is already up to date.
Bob does git checkout master && git pull. Master is already up to date.
Alice does git merge topic-branch-A
Bob does git merge topic-branch-B
Bob does git push origin master before Alice
Alice does g...
Java 8 Streams - collect vs reduce
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@Jimhooker2002 reread it. If you are, say, calculating the product then the reduction function can simply be applied to the split streams in parallel and then combined together at the end. The process of reducing always results in the the typ...
What is the theoretical maximum number of open TCP connections that a modern Linux box can have
...s being boasted about for normal boxes are around 80K for example single threaded Jabber messaging servers.
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Adding a regression line on a ggplot
... your original dataframe (in your case data).
It would look like this:
# read dataset
df = mtcars
# create multiple linear model
lm_fit <- lm(mpg ~ cyl + hp, data=df)
summary(lm_fit)
# save predictions of the model in the new data frame
# together with variable you want to plot against
predi...
How to unit test a Node.js module that requires other modules and how to mock the global require fun
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I suggest you read up on sinon.js. If you're using sinon (as in the example above) you would either innerLib.toCrazyCrap.restore() and restub, or call sinon via sinon.stub(innerLib, 'toCrazyCrap') which allows you to change how the stub b...