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Update createEventHub.md

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atomiks
2018-01-06 00:09:51 +11:00
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Creates a pubsub event hub with `emit`, `on`, and `off` methods. Creates a pubsub event hub with `emit`, `on`, and `off` methods.
For `emit`, resolve the array of handlers based on the `event` argument and then run For `emit`, resolve the array of handlers based on the `event` argument and then run
each one by passing in the data as an argument. each one with `Array.forEach()` by passing in the data as an argument.
For `on`, create an array for the event if it does not yet exist, then push the handler For `on`, create an array for the event if it does not yet exist, then use `Array.push()` to add the handler
into the array. to the array.
For `off`, find the index of the handler in the event array and remove it. For `off`, use `Array.findIndex()` to find the index of the handler in the event array and remove it.
```js ```js
const createEventHub = () => ({ const createEventHub = () => ({