ioeffect | An effect monad for Scalaz | Functional Programming library
kandi X-RAY | ioeffect Summary
kandi X-RAY | ioeffect Summary
A value of type IO[E, A] describes an effect that may fail with an E, run forever, or produce a single A. IO values are immutable, and all IO functions produce new IO values, enabling IO to be reasoned about and used like any ordinary Scala immutable data structure. IO values do not actually do anything. However, they may be interpreted by the IO runtime system into effectful interactions with the external world. Ideally, this occurs at a single time, in your application's main function (SafeApp provides this functionality automatically).
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ioeffect Examples and Code Snippets
Lines of Code : 18License : Non-SPDX (NOASSERTION)
Copyval analyzed =
for {
fiber1 <- analyzeData(data).fork // IO[E, Analysis]
fiber2 <- validateData(data).fork // IO[E, Boolean]
... // Do other stuff
valid <- fiber2.join
_ <- if (!valid) fiber1.interrupt val failure: IO[String, Unit] = IO.fail("Oh noes!")
val file: IO[Void, Data] = readData("data.json").attempt[Void].map {
case -\/ (_) => IO.point(NoData)
case \/-(data) => IO.point(data)
}
def sqrt(io: IO[Void, Double]): IO[NonNegErro import scalaz.ioeffect.{IO, SafeApp}
import scalaz.ioeffect.console._
import java.io.IOException
object MyApp extends SafeApp {
def run(args: List[String]): IO[Void, ExitStatus] =
myAppLogic.attempt.map(_.fold(_ => 1, _ => 0)).map(Exit Community Discussions
Trending Discussions on ioeffect
QUESTION
I'm getting the following runtime error after migrating from cats v1.1.0 to v1.4.0 (An error arises from places where .sequence (cats.Traverse) is used).
The code looks like:
...ANSWER
Answered 2019-Aug-19 at 13:22Try to change versions to
QUESTION
I am trying to type sagas. I am using the flow-typed definitions: https://github.com/flowtype/flow-typed/blob/master/definitions/npm/redux-saga_v0.13.x/flow_v0.36.x-v0.37.x/redux-saga_v0.13.x.js
...ANSWER
Answered 2017-Feb-07 at 09:59You need to import IOEffect from the libdef like this:
import type { IOEffect } from 'redux-saga/effects';
QUESTION
I'm trying to use scalaz's ioeffect IO[E,A] monad for a piece of code that is very effectful.
The code I'm trying to rewrite with IO[E,A] at a high level takes some metadata about a file that's store in a cloud. The code attempts to:
- download the file
- extract strings from the file
- build a pojo that contains the file text contents
- submits the pojo to some queue/restful service
The details of the steps aren't that important, but what I was thinking of doing was to do something along the lines of:
...ANSWER
Answered 2018-Dec-04 at 05:35Unfortunately, you do need a way to unify these errors into a common one:
for example:
QUESTION
I am using elixir phoenix websocket in an application I'm building and I have an epic that looks like this:
...ANSWER
Answered 2017-Jul-29 at 10:41Well I finally gave up on throwing an error when connection is dropped and changed this line observer.error({ type: WEBSOCKET_ERROR, error }) to observer.next({ type: WEBSOCKET_ERROR, error }). But I'm still wondering what I was doing wrong with retry. Any help with the original code will be greatly appreciated.
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