How do I sort an NSMutableArray with custom objects in it?

## Sort Array In Swift ##


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For `Swifty` Person below is a very clean technique to achieve above goal for globally. Lets have an example custom class of `User` which have some attributes.

class User: NSObject {
var id: String?
var name: String?
var email: String?
var createdDate: Date?
}

Now we have an array which we need to sort on the basis of `createdDate` either ascending and/or descending. So lets add a function for date comparison.

class User: NSObject {
var id: String?
var name: String?
var email: String?
var createdDate: Date?
func checkForOrder(_ otherUser: User, _ order: ComparisonResult) -> Bool {
if let myCreatedDate = self.createdDate, let othersCreatedDate = otherUser.createdDate {
//This line will compare both date with the order that has been passed.
return myCreatedDate.compare(othersCreatedDate) == order
}
return false
}
}

Now lets have an `extension` of `Array` for `User`. In simple words lets add some methods only for those Array's which only have `User` objects in it.


extension Array where Element: User {
//This method only takes an order type. i.e ComparisonResult.orderedAscending
func sortUserByDate(_ order: ComparisonResult) -> [User] {
let sortedArray = self.sorted { (user1, user2) -> Bool in
return user1.checkForOrder(user2, order)
}
return sortedArray
}
}


**Usage for Ascending Order**

let sortedArray = someArray.sortUserByDate(.orderedAscending)


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**Usage for Descending Order**

let sortedArray = someArray.sortUserByDate(.orderedAscending)


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**Usage for Same Order**

let sortedArray = someArray.sortUserByDate(.orderedSame)


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> Above method in `extension` will only be accessible if the `Array` is of type
> `[User]` || `Array<User>`