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Benjamin Encz @benjaminencz The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 1

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The Unreasonable Effectiveness Of Declarative Code And The Near Future of Programming The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 2

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The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 3

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The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 4

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The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 5

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The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 6

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The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 7

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Facts instead of Behavior usernameLabel.text <~ user.name ageLabel.text <~ user.age The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 8

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Facts instead of Behavior usernameLabel.text <~ user.name ageLabel.text <~ user.age The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 9

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Facts instead of Behavior usernameLabel.text <~ user.name ageLabel.text <~ user.age • Idempotent The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 9

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Facts instead of Behavior usernameLabel.text <~ user.name ageLabel.text <~ user.age • Idempotent • Commutative The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 9

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Facts instead of Behavior usernameLabel.text <~ user.name ageLabel.text <~ user.age • Idempotent • Commutative • Concurrent The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 9

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Facts instead of Behavior usernameLabel.text <~ user.name ageLabel.text <~ user.age • Idempotent • Commutative • Concurrent • Reactive The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 9

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Declarative Programming in Swift The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 10

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public protocol DownloadSyncable { static func handleServerResponse( response: SyncResponse, request: SyncRequest, state: SyncRequestState? ) -> ( changes: [ModelChange], newState: SyncRequestState?, nextRequest: SyncRequest? ) } The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 11

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The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 12

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• Fact instead of behavior -> Easier to reason about The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 12

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• Fact instead of behavior -> Easier to reason about • Interface forms DSL -> Constrained, unified implementation The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 12

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• Fact instead of behavior -> Easier to reason about • Interface forms DSL -> Constrained, unified implementation • Separation of concerns via indirection The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 12

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• Fact instead of behavior -> Easier to reason about • Interface forms DSL -> Constrained, unified implementation • Separation of concerns via indirection • Testability The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 12

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The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 13

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bit.ly/declarative-swift Further Reading: Declarative API Design in Swift (me) Defining Declarative (awelonblue) @benjaminencz The Unreasonable Effectiveness Of Declarative Code | @benjaminencz | Swift Summit, November 2016 14