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Which cryptographic hash function should I choose?
... three separate functions.
Collision resistance: How hard is it for someone to find two messages (any two messages) that hash the same.
Preimage Resistance: Given a hash, how hard is it to find another message that hashes the same? Also known as a one way hash function.
Second preimage resistance...
SQL set values of one column equal to values of another column in the same table
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Sounds like you're working in just one table so something like this:
update your_table
set B = A
where B is null
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What is a None value?
I have been studying Python, and I read a chapter which describes the None value, but unfortunately this book isn't very clear at some points. I thought that I would find the answer to my question, if I share it there.
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Why is a combiner needed for reduce method that converts type in java 8
...se mapToInt(String::length) over mapToInt(s -> s.length()), not sure if one would be better over the other, but I prefer the former for readability.
– skiwi
Jun 19 '14 at 15:35
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Big O, how do you calculate/approximate it?
...gth value. Now we need the actual definition of the function f(). This is done from the source code, in which each interesting line is numbered from 1 to 4.
There are many ways to calculate the BigOh. From this point forward we are going to assume that every sentence that doesn't depend on the size...
Class method differences in Python: bound, unbound and static
...and unbound methods.
Basically, a call to a member function (like method_one), a bound function
a_test.method_one()
is translated to
Test.method_one(a_test)
i.e. a call to an unbound method. Because of that, a call to your version of method_two will fail with a TypeError
>>> a_test...
How to cast List to List
...pointed. -- Meanwhile, .NET has two separate extension methods for this -- one called .Cast<T>() and one called .OfType<T>(). The former performs a cast on each element (throwing the desired exceptions) while the latter filters out elements that can't be cast (so you would pick one depe...
Java - Convert integer to string [duplicate]
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they are practically the same (the last one invokes the first one, and the 2nd one is compiled to the first one). I prefer the 1st one
– Bozho
Jun 3 '13 at 9:39
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How do you fix a bad merge, and replay your good commits onto a fixed merge?
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Please don't use this recipe if your situation is not the one described in the question. This recipe is for fixing a bad merge, and replaying your good commits onto a fixed merge.
Although filter-branch will do what you want, it is quite a complex command and I would probably choos...
Should I use single or double colon notation for pseudo-elements?
... hand this is more verbose than necessary; for now, you can stick with the one-colon notation.
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