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What is the difference between JavaConverters and JavaConversions in Scala?
...n scala.collection , there are two very similar objects JavaConversions and JavaConverters .
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How to explain callbacks in plain english? How are they different from calling one function from ano
...on will set this variable with the information about function to be called and will call the function using the same variable.
In javascript, the example is below. Here we use method argument as a variable where we store information about function.
function processArray(arr, callback) {
var re...
Test if a property is available on a dynamic variable
...trying to access it, unless you re-implemented the way dynamic binding is handled in the C# compiler. Which would probably include a lot of guessing, because it is implementation-defined, according to the C# specification.
So you should actually try to access the member and catch an exception, if i...
Salting Your Password: Best Practices?
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Prefix or suffix is irrelevant, it's only about adding some entropy and length to the password.
You should consider those three things:
The salt has to be different for every password you store. (This is quite a common misunderstanding.)
Use a cryptographically secure random number generat...
Docker and securing passwords
...menting with Docker recently on building some services to play around with and one thing that keeps nagging me has been putting passwords in a Dockerfile. I'm a developer so storing passwords in source feels like a punch in the face. Should this even be a concern? Are there any good conventions on h...
Choice between vector::resize() and vector::reserve()
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The two functions do vastly different things!
The resize() method (and passing argument to constructor is equivalent to that) will insert or delete appropriate number of elements to the vector to make it given size (it has optional second argument to specify their value). It will affect the ...
filter for complete cases in data.frame using dplyr (case-wise deletion)
...works, of course. But that is a) verbose when there are a lot of variables and b) impossible when the variable names are not known (e.g. in a function that processes any data.frame).
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How can I combine two commits into one commit? [duplicate]
...a branch 'firstproject' with 2 commits. I want to get rid of these commits and make them appear as a single commit.
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How do I use the lines of a file as arguments of a command?
...ers), a shortcut for $(cat afile) is $(< afile), so you'd write:
mycommand "$(< file.txt)"
Documented in the bash man page in the 'Command Substitution' section.
Alterately, have your command read from stdin, so: mycommand < file.txt
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Two single-column indexes vs one two-column index in MySQL?
I'm faced with the following and I'm not sure what's best practice.
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