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Ask Time：2011-02-07T08:27:46 Author：Gainster
What makes a language functional ? In what scenario I should go with functional languages to solve the problem. Is there any major app developed using functional language or it is still in research ?
I need to populate an array, but not by directly counting and splitting the numbers. I need to do generate the following: [[a,a,a,a], [a,a,a,b], [a,a,a,c]..... [f,f,f,d], [f,f,f,e], [f,f,f,f]] A...
I need to write on a module to be run on GHCi, with a function composition to the same function. This (The classic fog(x) = f(g(x))) runs: (.) f g = (\x -> f (g x)). The problem appears when ...
I'm trying to compose F-Algebras like in this page. The difference is that, instead of composing with a tuple, like this: type FAlgebra[F[_], A] = F[A] => A def algebraZip[F[_], A, B](fa: FAlg...
I have the following code: interface F { (): string; a(): number; } function f() { return '3'; } f['a'] = function () { return 3; }; Then I want to assign
I need any function with this signature : ignore :: Applicative f => f a -> f () Can someone point me to the right direction ? Thanks!
CppCheck (v1.72) says there is a difference when using (*f) or just *f. The this case void test(float *f) { float a = 0.0f; if(*f>a) { (*f) += 0.01f; if(*f<a) *f=...
The following typechecks: instance (Applicative f, Alternative f, Foldable f) => Monad f where (>>=) = flip $ \f -> foldr (<|>) empty . fmap f -- Or equivalently a >>...
How can I in coq, prove that a function f that accepts a bool true|false and returns a bool true|false (shown below), when applied twice to a single bool true|false would always return that same va...
Is there any type-safe way to write a function bi f a b = (f a, f b) such that it would be possible to use it like this: x1 :: (Integer, Char) x1 = bi head [2,3] "45" x2 :: (Integer, Char) x2 =...
let passFive f = (f 5) let passFive f = f 5 What's difference between them? I found they are both like below: val passFive : (int -> 'a) -> 'a