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# Notifications
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https://developer.apple.com/reference/foundation/nsnotificationcenter
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## You should do the following:
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1. Create a branch from develop called feature/notifications
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2. Add “Randomize order” button to `OrganizationInfoViewController`. It should randomize the order of employees in an organization.
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3. Declare `kEmployeesOrderHasChanged` string constant.
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4. Implement a logic of reloading table view on `MainViewController` after randomizing order in `OrganizationViewController` with the help of `NSNotificationCenter`.
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5. Create a pull request from your branch to develop.
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## You should be able to answer the following questions:
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* What is `NSNotificationCenter`?
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* What is the difference between delegation and notifications patterns?
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* How to unsubscribe from notifications? How and when should it be used? Is it mandatory? |
