Update createEventHub.md
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Creates a pub/sub ([publish–subscribe](https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern)) event hub with `emit`, `on`, and `off` methods.
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Set a `hub` property using `Object.create(null)` to create a truly empty object that does not inherit properties from `Object.prototype` (which would be resolved if the event name matched one of the properties).
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For `emit`, resolve the array of handlers based on the `event` argument and then run
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each one with `Array.forEach()` by passing in the data as an argument.
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Use `Object.create(null)` to create an empty `hub` object that does not inherit properties from `Object.prototype`.
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For `emit`, resolve the array of handlers based on the `event` argument and then run each one with `Array.forEach()` by passing in the data as an argument.
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For `on`, create an array for the event if it does not yet exist, then use `Array.push()` to add the handler
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to the array.
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For `off`, use `Array.findIndex()` to find the index of the handler in the event array and remove it using `Array.splice()`.
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```js
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