scalaz

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scalaz List[StateT].sequence - could not find implicit value for parameter n: scalaz.Applicative

I\'m trying to figure out how to use StateT to combine two State state transformers based o开发者_运维问答n a comment on my Scalaz state monad examples answer.[详细]

2023-04-13 02:27 分类：问答
String seen as a Monoid

Given a signature like this one or that one: def foo[A, F[_]](implicit mon: Monoid[F[A]], pr: Pure[F]): F[A][详细]

2023-04-10 09:33 分类：问答
In Scala, is there a shorthand for reducing a generic type's arity?

I want to call Scalaz\'s pure method to put a value into the State monad. The following works: type IntState[A] = State[Int, A][详细]

2023-04-10 04:43 分类：问答
Conditional invocation of a method in Scala

I\'ve found this pattern quite a few times in my code: if (doIt) object.callAMethod else object I\'m wondering if there could be a syntactically more pleasing way to write the code above, especiall[详细]

2023-04-02 22:57 分类：问答
How to reduce Seq[Either[A,B]] to Either[A,Seq[B]]?

Given a sequence of eithers开发者_Python百科 Seq[Either[String,A]] with Left being an error message. I want to obtain an Either[String,Seq[A]] where I get a Right (which will be a Seq[A]), if all elem[详细]

2023-03-31 17:40 分类：问答
Will using Scala in a more functional way (scalaz) incur a performance/maintainability penalty?

I\'m currently working on a small project (< 10k loc) which is mainly pure but relies on mutable optimizations mainly based on iterators and some data-structure reuse for heavy-duty calculations.[详细]

2023-03-28 11:11 分类：问答
How can I combine two Function0 val's into one Function0

I imagine something like this: def combine[A, B, C](f: (A, B) => C): (M[A], M[B]) => M[C] while M would be Function0. Is this possi开发者_运维技巧ble in scalaz?import scalaz._; import Scalaz.[详细]

2023-03-15 12:15 分类：问答
Porting python-twisted based code to scala: framework advice needed

I am trying to port a significant amount of code written in python with twisted to scala, and I\'m looking for opinions on what framework combination to choose.[详细]

2023-03-06 13:08 分类：问答
Tail-recursion and scalaz promises

I am currently playing with Scalaz non-blocking futures aka. Promises. I am struggling to make the following function tail-recursive:[详细]

2023-03-04 03:58 分类：问答
Scalaz validation and ApplicativeBuilder limits

We\'re using scalaz validation trait in our project to validate HTTP parameters. The common case is taking few validate开发者_开发问答d values and performing neccessary action only if all of them are[详细]

2023-02-27 06:53 分类：问答