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Please see #250 and http://hackage.haskell.org/package/base-4.10.1.0/docs/Data-Function.html#v:on
implementation idea :
```js
// Psi
const on = const psi = curry((f, g, x, y) => f(g(x))(g(y)));…
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Here's another combinator in `reflex` missing that's from `reactive-banana`:
```haskell
coincidence :: Event (Event a) -> Event a
```
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I experimented with adding a `.debug()` combinator. This is my draft code:
```rust
mod combineext {
use combine::parser::{Parser, ParseMode};
use combine::stream::{RangeStream, StreamOnce}…
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Thanks to [this comment](https://github.com/css-modules/css-modules/pull/65#issuecomment-294244374) I was able to figure out how to combine module-specific munged names with global styles so it's easi…
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Or find alternatives:
- [x] `anyToken`
- [x] `eof`
- [x] `notFollowedBy`
- [ ] `manyTill`
- [ ] `lookAhead`
[Code can be found here](https://hackage.haskell.org/package/parsec-3.1.14.0/docs/…
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[`anyTill`](https://hackage.haskell.org/package/replace-megaparsec-1.4.4.0/docs/Replace-Megaparsec.html#v:anyTill) should be a primitive combinator.
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These are lens-like combinators that could be used for manipulating arrows in funflow and porcupine. They are based on the code in the [profunctor-optics](https://hackage.haskell.org/package/profuncto…
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In haskell's standard library there is that nice combinator, `on`, whose signature would be:
``` ocaml
val on : ('b -> 'b -> 'c) -> ('a -> 'b) -> 'a -> 'a -> 'c
```
and it would be used like this:
…
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get people to derive the combinators themselves, then in other exercises have them passed in so they can use them to achieve some goal.
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Could this combinator be provided?
```haskell
valueE :: MonadMoment m => Event a -> m (Maybe a)
```