# store

[![Package Version](https://img.shields.io/hexpm/v/store)](https://hex.pm/packages/store)
[![Hex Docs](https://img.shields.io/badge/hex-docs-ffaff3)](https://hexdocs.pm/store/)
![Erlang-compatible](https://img.shields.io/badge/target-erlang-b83998)
![JavaScript-compatible](https://img.shields.io/badge/target-javascript-f1e05a)

An immutable store structure, with the ability to add subscribers. Subscribe with callbacks that will be called when a set or update is called on a store. Checkout the mutable version, [mut_cell](https://hexdocs.pm/mut_cell/) with a mutable store that changes the value in place.

## Install
```sh
gleam add store@1
```
```gleam
import store
import gleam/int
import gleam/io

pub fn main() {
  let cell = store.make(10)

  let #(cell, unsub) =
    cell
    |> store.subscribe(fn(value) {
      { "value: " <> value |> int.to_string } |> io.println
    })

  let cell = cell |> store.set(20)

  let cell = unsub(cell)

  let cell = cell |> store.set(30)

  cell
  |> store.get
  |> int.to_string
  |> io.println
}
```

Further documentation can be found at <https://hexdocs.pm/store>.