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Two-way encryption: I need to store passwords that can be retrieved
...e. There are some encryption schemes that are impossible to crack such as OneTimePad).
Where do I store the private key?
What I would do is use 3 keys. One is user supplied, one is application specific and the other is user specific (like a salt). The application specific key can be stored anywh...
How to mount a host directory in a Docker container
...ing to mount a host directory into a Docker container so that any updates done on the host is reflected into the Docker containers.
...
Convert pandas dataframe to NumPy array
...c'])
df.to_numpy()
array([[1, 4],
[2, 5],
[3, 6]])
As mentioned above, this method is also defined on Index and Series objects (see here).
df.index.to_numpy()
# array(['a', 'b', 'c'], dtype=object)
df['A'].to_numpy()
# array([1, 2, 3])
By default, a view is returned, so any modifi...
How to clone a case class instance and change just one field in Scala?
...t; 'sentMessages
val existingPersona = Persona("store", "apple", Set("iPhone"))
// When you need the new copy, by setting the value,
val newPersona1 = messageLens.set(existingPersona)(Set.empty)
// or by other operation based on current value.
val newPersona2 = messageLens.modify(existingPersona)...
Undefined, unspecified and implementation-defined behavior
...
Undefined behavior is one of those aspects of the C and C++ language that can be surprising to programmers coming from other languages (other languages try to hide it better). Basically, it is possible to write C++ programs that do not behave in ...
What is the difference between a strongly typed language and a statically typed language?
Also, does one imply the other?
8 Answers
8
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Delete directory with files in it?
...check for dots (. and ..) and it deletes the resolved path, not the actual one.
– Alix Axel
Jun 1 '11 at 7:53
9
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What is the difference between “INNER JOIN” and “OUTER JOIN”?
...ately. An outer join will give the results of A intersect B in addition to one of the following: all of A (left join), all of B (right join) or all of A and all of B (full join). Only this last scenario is really A union B. Still, a well written explanation.
– Thomas
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Decompile .smali files on an APK [duplicate]
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The correct link for classyshark is this one: github.com/google/android-classyshark
– Mr Washington
May 30 '19 at 11:10
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How can I check if a string represents an int, without using try/except?
...he strings that Python considers integers. I say just be pythonic on this one.
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