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authorBen Beltran <ben@nsovocal.com>2019-03-14 23:19:58 +0100
committerBen Beltran <ben@nsovocal.com>2019-03-14 23:19:58 +0100
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parent4efcafab7f0aa454f9ebe767133654bc9f44e12c (diff)
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-# event-kit
-
-This is a simple library for implementing event subscription APIs.
-
-## Implementing Event Subscription APIs
-
-```coffee
-{Emitter} = require 'event-kit'
-
-class User
- constructor: ->
- @emitter = new Emitter
-
- onDidChangeName: (callback) ->
- @emitter.on 'did-change-name', callback
-
- setName: (name) ->
- if name isnt @name
- @name = name
- @emitter.emit 'did-change-name', name
- @name
-
- destroy: ->
- @emitter.dispose()
-```
-
-In the example above, we implement `::onDidChangeName` on the user object, which
-will register callbacks to be invoked whenever the user's name changes. To do
-so, we make use of an internal `Emitter` instance. We use `::on` to subscribe
-the given callback in `::onDidChangeName`, and `::emit` in `::setName` to notify
-subscribers. Finally, when the `User` instance is destroyed we call `::dispose`
-on the emitter to unsubscribe all subscribers.
-
-## Consuming Event Subscription APIs
-
-`Emitter::on` returns a `Disposable` instance, which has a `::dispose` method.
-To unsubscribe, simply call dispose on the returned object.
-
-```coffee
-subscription = user.onDidChangeName (name) -> console.log("My name is #{name}")
-# Later, to unsubscribe...
-subscription.dispose()
-```
-
-You can also use `CompositeDisposable` to combine disposable instances together.
-
-```coffee
-{CompositeDisposable} = require 'event-kit'
-
-subscriptions = new CompositeDisposable
-subscriptions.add user1.onDidChangeName (name) -> console.log("User 1: #{name}")
-subscriptions.add user2.onDidChangeName (name) -> console.log("User 2: #{name}")
-
-# Later, to unsubscribe from *both*...
-subscriptions.dispose()
-```
-
-## Creating Your Own Disposables
-
-Disposables are convenient ways to represent a resource you will no longer
-need at some point. You can instantiate a disposable with an action to take when
-no longer needed.
-
-```coffee
-{Disposable} = require 'event-kit'
-
-disposable = new Disposable => @destroyResource()
-```