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What part of Hindley-Milner do you not understand?
...the part of the answer related to [Inst] is a bit inaccurate. This is only my understanding so far, but the sigmas in the [Inst] and [Gen] rules don't refer to types, but to type-schemes. So the ⊑ operator is a partial ordering unrelated to sub-typing as we know it from OO languages. It's related ...
Redis strings vs Redis hashes to represent JSON: efficiency?
...urth solution is the most expensive +70 byte per each attribute for sure.
My suggestion how to optimize such dataset:
You've got two options:
If you cannot guarantee max size of some user attributes than you go for first solution and if memory matter is crucial than
compress user json before ...
How can I create a copy of an object in Python?
...may be not a very clear concept -- how deep is deep enough?)
According to my tests with Python 3, for immutable objects, like tuples or strings, it returns the same object (because there is no need to make a shallow copy of an immutable object), but for lists or dictionaries it creates an independe...
What are copy elision and return value optimization?
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Hmm, but in my opinion, this MUST be a feature we can rely on. Because if we can't, it would severely affect the way we implement our functions in modern C++ (RVO vs std::move). During watching some of the CppCon 2014 videos, i really go...
Java string to date conversion
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@mannedear oh sorry.. that was my mistake. Anyway I got the answer you can see it here : stackoverflow.com/questions/50982310/…
– Queendevelopers
Jul 30 '18 at 13:59
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Multi-key dictionary in c#? [duplicate]
...multi-field keys; that means you might write something like:
sealed class MyValueObject : ValueObject<MyValueObject> {
public DayOfWeek day;
public string NamedPart;
//properties work fine too
}
...which hopefully makes it easier to have human-readable names for data with value ...
What does if __name__ == “__main__”: do?
...he food for thought section.what does from foo2.py import functionB do? In my view it just imports foo2.py from functionB
– user471651
Feb 24 '19 at 13:47
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Ruby on Rails Server options [closed]
The whole issue of setting up a development server for my Ruby on Rails application confuses me. There are WEBrick, Mongrel, Passenger, Apache, Nginx and many more I am sure, and I don't really understand the different roles they play.
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Please explain the exec() function and its family
...doing a project requiring us to use exec() and your description solidified my understanding.
– TwilightSparkleTheGeek
Jun 25 '14 at 17:15
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What's “P=NP?”, and why is it such a famous question? [closed]
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A short summary from my humble knowledge:
There are some easy computational problems (like finding the shortest path between two points in a graph), which can be calculated pretty fast ( O(n^k), where n is the size of the input and k is a consta...