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In Functional Programming, what is a functor?
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The word "functor" comes from category theory, which is a very general, very abstract branch of mathematics. It has been borrowed by designers of functional languages in at least two different ways.
In the ML family of languages, a functor is a mo...
Operator Overloading with C# Extension Methods
... release of C#. Mads talked a bit more about implementing it in this video from 2017.
On why it isn't currently implemented, Mads Torgersen, C# Language PM says:
...for the Orcas release we decided to
take the cautious approach and add
only regular extension methods, as
opposed to extention propert...
What is the difference between include and require in Ruby?
...can use
the load method.
The include method takes all the
methods from another module and
includes them into the current module.
This is a language-level thing as
opposed to a file-level thing as with
require. The include method is the
primary way to "extend" classes with
other ...
Encode String to UTF-8
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@Michael: he is clearly having trouble getting bytes from string. How is getBytes(encoding) missing the point? I think second line is there just to check if he can convert it back.
– Peter Štibraný
Apr 20 '11 at 12:01
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Understanding events and event handlers in C#
...to replace myFactory.GetInstance() into myOfflineFakeFactory.GetInstance() from one central place (aka factory method pattern).
Factory method pattern
So, if you have a TheOtherClass class and it needs to use the myFactory.GetInstance(), this is how the code will look like without delegates (you'll ...
Is there a function that returns the current class/method name? [duplicate]
...n is expensive and is sometimes unnecessary. The question typically stems from an aversion to hard-coding the name - despite actually knowing it. But you can let the compiler handle it by using nameof(<MethodNameHere>) in place of the string. True, it doesn't save you from copy/paste errors...
Converting a list to a set changes element order
...sertion order, you can use the keys of a Python dictionary, which starting from Python 3.7 is guaranteed to preserve the insertion order:
>>> a = dict.fromkeys([1, 2, 20, 6, 210])
>>> b = dict.fromkeys([6, 20, 1])
>>> dict.fromkeys(x for x in a if x not in b)
{2: None, 21...
What are the advantages of using a schema-free database like MongoDB compared to a relational databa
...speak french, take a look at this article explaining how to set up MongoDB from scratch.
Edit: I almost forgot to tell you about this railscast by Ryan. It's very interesting and makes you want to start right away!
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Get the real width and height of an image with JavaScript? (in Safari/Chrome)
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Use the naturalHeight and naturalWidth attributes from HTML5.
For example:
var h = document.querySelector('img').naturalHeight;
Works in IE9+, Chrome, Firefox, Safari and Opera (stats).
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What is thread contention?
...e a lock is one type of thing that there can be contention over, it is far from the only such thing. There can be contention for lockless resources as well. (For example, if two threads keep atomically incrementing the same integer, they may experience contention due to cache ping-ponging. No locks ...