https://github.com/iokasimov/observable

Make your actions observable and listen events from them, algebraically.
https://github.com/iokasimov/observable

continuation observer

Last synced: 2 months ago
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Make your actions observable and listen events from them, algebraically.

• Host: GitHub
• URL: https://github.com/iokasimov/observable
• Owner: iokasimov
• License: bsd-3-clause
• Created: 2018-06-13T13:39:53.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-12-10T14:20:28.000Z (about 6 years ago)
• Last Synced: 2023-09-20T09:34:27.076Z (over 1 year ago)
• Topics: continuation, observer
• Language: Haskell
• Homepage: http://hackage.haskell.org/package/observable
• Size: 26.4 KB
• Stars: 14
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
# Make your actions to be observable and listen events from them, algebraically.

Let's imagine simple example: we want to listen to STDIN. We have `getLine` function that can capture a list of ASCII-symbols - all we need is to make this action to be observable.

```haskell

obs :: Monad f => f a -> Observable f a r

```

Good, now we want to subscribe on events and set up callback, if we want to listen events forever, we need `subscribe` function:

```haskell

subscribe :: Applicative f => Observable f a r -> (a -> f r) -> f r

```

First, we make action to be observable, then set up callback and at the end, subscribe on events:

```haskell

subscribe (obs getLine) handler

```

Our handler will count amount of characters in strings and send this into STDOUT:

```haskell

handler = print . (<>) "Length of string was: " . show . length

```

Let's try it out:

```haskell

> hello, my dear friend!

> "Length of string was: 22"

```