Update createEventHub.md
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@ -30,10 +30,10 @@ const createEventHub = () => ({
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```
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```
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```js
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```js
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const fn = data => console.log(data);
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const fn = data => console.log(data.hello);
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const hub = createEventHub();
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const hub = createEventHub();
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hub.on('message', fn); // subscribe a handler to listen for 'message' events
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hub.on('message', fn); // subscribe the handler to listen for 'message' events
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hub.emit('message', 'hello!'); // console logs 'hello!'
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hub.emit('message', { hello: 'world' }); // logs 'world'
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hub.off('message', fn); // unsubscribe our handler from 'message'
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hub.off('message', fn); // unsubscribe the handler from 'message' events
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```
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```
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