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What is a monad?
...ay<U> and return an Array<U>.
Generalized, a monad is any type Foo<Bar> which has a "bind" method which takes a function argument of type Bar => Foo<Baz> and returns a Foo<Baz>.
This answers what monads are. The rest of this answer will try to explain through example...
Relationship between SciPy and NumPy
...s in its own namespace. In other words, if there's a function named numpy.foo , there's almost certainly a scipy.foo . Most of the time, the two appear to be exactly the same, oftentimes even pointing to the same function object.
...
Is there a way to instantiate objects from a string holding their class name?
...of boost::variant<A, B, C, D, ...> instead. Like if you have a class Foo, Bar and Baz, it looks like this:
typedef boost::variant<Foo, Bar, Baz> variant_type;
template<typename T> variant_type createInstance() {
return variant_type(T());
}
typedef std::map<std::string, v...
Can you help me understand Moq Callback?
...ns; the other happens after the call returns.
var message = "";
mock.Setup(foo => foo.Execute(arg1: "ping", arg2: "pong"))
.Callback((x, y) =>
{
message = "Rally on!";
Console.WriteLine($"args before returns {x} {y}");
})
.Returns(message) // Rally on!
.Call...
Why does C++ need a separate header file?
... no concern for building separately, then you could do that by just having foo_interface.h include foo_implementation.h.
– Steve Jessop
Mar 19 '15 at 9:02
...
How dangerous is it to access an array out of bounds?
...sting is that hyper-modern compilers may decide that if code tries to read foo[0] through foo[len-1] after having previously used a check of len against the array length to either execute or skip a piece of code, the compiler should feel free to run that other code unconditionally even if the applic...
How does the Java 'for each' loop work?
...not implement Iterable so you can't for(String s : (Iterator<String>)foo). I understand why this is, but it is irritating.
– Christopher Schultz
Oct 18 '19 at 20:21
...
Can we define implicit conversions of enums in c#?
... }
public static class MyEnumExt
{
public static int Value(this MyEnum foo) { return (int)foo; }
static void Main()
{
MyEnum val = MyEnum.A;
int i = val.Value();
}
}
This doesn't give you a lot, though (compared to just doing an explicit cast).
One of the main time...
Why use symbols as hash keys in Ruby?
...troduced a simplified syntax just for hash with symbols keys (e.g. h.merge(foo: 42, bar: 6)), and Ruby 2.0 has keyword arguments that work only for symbol keys.
Notes:
1) You might be surprised to learn that Ruby treats String keys differently than any other type. Indeed:
s = "foo"
h = {}
h[s] = ...
How can I know which parts in the code are never used?
...sis using the AST of the entire program is the way to get it. (Preventing foo() from being marked as "called" when it appears only in if (0) { foo(); } would be a bonus but requires extra smarts.)
– j_random_hacker
Jan 27 '11 at 10:11
...