Reflex is a Haskell library, providing high-performance, deterministic, higher-order Functional Reactive Programming system
Reflex is a Haskell library, providing high-performance, deterministic, higher-order Functional Reactive Programming system
Questions tagged [reflex]
74 questions
1
vote
2 answers
Switching to an event wrapped in monadic context
My specific problem is like this:
Given an Event t [a] and an Event t () (let's say it's a tick event), I want to produce an Event t a, that is, an event that is giving me consecutive items from input list for every occurence of tick event.
Reflex…
Bartosz
- 3,318
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0
votes
1 answer
How to match *anything* until a delimiter is encountered in RE-flex lexer?
I was using RE/flex lexer for my project. In that, I want to match the syntax corresponding to ('*)".*?"\1. For eg, it should match "foo", ''"bar"'', but should not match ''"baz"'.
But RE/flex matcher doesn't work with lookaheads, lookbehinds and…
Sourav Kannantha B
- 2,860
- 1
- 11
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0
votes
0 answers
nix attribute `stdenv` missing on a reflex-stone haskell project
I was able to run nix-shell in my codebase about two years back on another macbook.
I got a new freshly installed nix setup
❯ nix-env --version
nix-env (Nix) 2.12.0
❯ uname
Darwin
❯ sw_vers
ProductName: macOS
ProductVersion: 12.0.1
BuildVersion: …
iluvAS
- 513
- 4
- 9
0
votes
0 answers
Are FRP frameworks good tools for creating a network of spiking neurons
Do functional reactive programming (FRP) frameworks provide a good setting for creating a network of spiking neurons?
Such a network looks as follows: There is a connectivity graph that defines which neurons receive input from which other neurons…
user81238121
- 1
- 1
0
votes
0 answers
How to link Reflex with PCRE2?
After installing pcre2, i tried to compile the project with reflex however i get the following error,
not sure, I guess I have this set up wrong, however I don't know how to get it done.
how I can fix this?
Nguyen Manh
- 73
- 1
- 6
0
votes
1 answer
Can I get IntPtr from IDirect3D11Device
I am using Win2D. I want to apply NVIDIA Reflex SDK to my game. To achieve this, NVIDIA Reflex SDK requests Direct3DDevice object. I think CanvasDevice (which implements IDirect3D11Device) matches Direct3DDevice.
So, how can I get a native…
P. ful
- 113
- 9
0
votes
1 answer
Sharing dynamic between frontend head and body
New to haskell, but I'm not sure that you can create a dynamic that can go into both head and body. I'd like to update page title.
janat08
- 1,725
- 2
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- 27
0
votes
1 answer
Monadwidget in Frontend type
Some of the examples use monadwidget, with mainwidget. While obelisk generated project expects you to use a frontend data type. I couldn't find a reference to this type in the guide, but how would you use monadwidget within the type?
janat08
- 1,725
- 2
- 16
- 27
0
votes
1 answer
getAndDecodeResponseEvent runs 3 times, instead of just once
This little pice of code has me confused:
respCount counts to 3 in case the url exists, to 2 in case of 404, but shouldn't it only count to 1? Also, the actual request gets issued just once.
I'm on the latest develop branch of reflex,…
Schoon
- 394
- 1
- 9
0
votes
1 answer
How to make MonadError work with ghcjs/reflex
I'm struggling to compile the following program:
import Data.Maybe
import qualified Data.Text as T
import qualified Data.Text.IO as T
import Data.URLEncoded
import Reflex.Dom
url :: T.Text
url = T.pack…
bongsun
- 15
- 4
0
votes
1 answer
Cannot map through Dynamic: No instance for (Functor (Dynamic Spider))
My intention is to alternate the colour of a div between bright red and dark
red as a button gets pressed, starting with dark red.
I have this code:
{-# LANGUAGE
OverloadedStrings
#-}
module Main where
import Data.Map (Map)
import…
Ignat Insarov
- 4,660
- 18
- 37
0
votes
1 answer
How to add an html entity with Reflex.Dom?
As it should be text "© is rendered escaped. How then should I render the © html entity unescaped with Reflex.Dom?
philderbeast
- 267
- 2
- 8
0
votes
1 answer
Haskell: How to fix the "type variable ambigous" compiler error?
I'm using GHCJSi, version 0.2.0-7.10.3: http://www.github.com/ghcjs/ghcjs/ and the reflex-dom library version 0-4 from https://github.com/reflex-frp/reflex-dom. I'm not using reflex-dom-0.3 from Hackage.
The following Haskell program does not…
Jogger
- 1,617
- 2
- 12
- 22
-1
votes
1 answer
Need help understanding this this function
Dim i as Long, arr(5) As Long
for i = 1 to 6
arr(i-1) = i-1
next
console.writeLine(arr(LBound(arr)+5) + arr(UBound(arr)-2))
I understand the output is 8 but could someone explain why it is 8, Lbound and UBound, this type of question comes up…
loco3424
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