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Best way to merge two maps and sum the values of same key?
...mutable.Map[Int,Int] = Map(1 -> 109, 3 -> 300, 2 -> 20)
Specifically, the binary operator for Map[K, V] combines the keys of the maps, folding V's semigroup operator over any duplicate values. The standard semigroup for Int uses the addition operator, so you get the sum of values for eac...
Convert bytes to a string
... very common encoding, but you
# need to use the encoding your data is actually in.
>>> b"abcde".decode("utf-8")
'abcde'
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How to use the 'main' parameter in package.json?
...t to your
program. That is, if your package is named foo, and a user installs
it, and then does require("foo"), then your main module's exports
object will be returned.
This should be a module ID relative to the root of your package
folder.
For most modules, it makes the most sense...
How to fully clean bin and obj folders within Visual Studio?
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As others have responded already Clean will remove all artifacts that are generated by the build. But it will leave behind everything else.
If you have some customizations in your MSBuild project this could spell trouble and leave behind stuff you would think it should have...
How to sort git tags by version string order of form rc-X.Y.Z.W?
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you can use homebrew or macports to install the gnu version of sort. brew install gsort then you can modify the line above to git tag -l | gsort -V and it should work for you.
– Goran
Feb 24 '14 at 13:16
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How can I check for “undefined” in JavaScript? [duplicate]
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I personally use
myVar === undefined
Warning: Please note that === is used over == and that myVar has been previously declared (not defined).
I do not like typeof myVar === "undefined". I think it is long winded and unnecessar...
Truncating floats in Python
...o the binary value stored in the computer's memory, not the string you actually typed into the source code.1
If you decode the sequence of bits back into a decimal number, again using the IEEE 64-bit floating-point format, you get
0.2999999999999999888977697537484345957637...
so a naive implemen...
How to track child process using strace?
...ously search for the parent thread, then the grandparent thread, and so on all the way to the root process.
4 Answers
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Recursively remove files
... Yes, that is what the print0 and the -0 to xargs is for. Normally it wouldn't handle spaces correctly, however with print0 it will print the filename with a null character at the end of the line, which xarg with -0 will then use to pass the full path to xargs without a chance of having...
Is there a way to cache GitHub credentials for pushing commits?
...itched to synchronizing my repositories to https:// on GitHub (due to firewall issues), and it asks for a password every time.
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