redux-whenever.js

Subscribe to a state subtree (or leaf) and run callbacks whenever it evaluates to a given value.

Usage

$3

``js
const whenever = require('redux-whenever')
const redux = require('redux')

// Pass whenever as an enhancer
const store = redux.createStore(reducer, whenever)

// Pass the state selector you are interested in as a string.
// callback will execute only when player.isReady becames true
store.whenever('player.isReady', true, (curState, prevState) => {
// Your magic here
})
`

$3


`js
const unsubscribe = store.whenever('player.isReady', true, callback)
unsubscribe() // Removes previously added listener
`

API

$3

Returns a function that, if called, removes the added subscriber.

#### selector
- type: String|Function

Should return a piece of the state tree

#### assertion
- type: String|Number|Object|Function

If a function, it will be executed. If not, it's equality will be compared against current state.

#### callback
- type: Function

Installation

`
npm install --save redux-whenever
``

Credits

- Icon by Scott Lewis from the Noun Project

---

caiogondim.com  · 
GitHub @caiogondim  · 
Twitter @caio_gondim