MongoDB World 2018: A Swift Introduction to Swift
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Swift is a new programming language released by Apple in 2014 that is designed to be safer, more modern, and work seamlessly with Objective-C. The document discusses building a MongoDB driver in Swift, highlighting some of Swift's key features like protocols, extensions, generics, and optionals that make it well-suited for this task. Interfacing Swift with existing C-based MongoDB drivers also presents challenges around representing BSON data types and pointer types that the driver had to address. Future work on the driver includes implementing more of the MongoDB API and taking advantage of newer Swift features.
MongoDB World 2018: A Swift Introduction to Swift
- 1. A Swift Introduction to Swift Kaitlin Mahar
- 2. What makes Swift Swift?
- 3. Kaitlin Mahar Drivers Engineer @ MongoDB
- 4. What is a MongoDB driver? app driver MongoDB … !! BSON 00101...
- 5. Why build a Swift driver? Perfect MongoDB Mobile Swift web frameworks
- 6. What is Swift, anyway?
- 7. What is Swift? • released in 2014, open-sourced in 2015 • up to version 4.1.2
- 8. Why did Apple create Swift? “Objective-C without the C”
- 9. So why do people still use Objective-C? young language small community breaking changes
- 10. So why should I use Swift?
- 11. Swift makes working with C libraries easy.
- 12. The Swift driver wraps the C driver. Swift app MongoDB Swift driver C driver
- 13. Swift can run in the same program as C. C Objective-C
- 14. Descriptive Pointer Types OpaquePointer • Points to a C type that can’t be represented in Swift because we can’t access its internals • Can’t be dereferenced UnsafePointer<T> • Points to a C type, T, that we can access internals of • Can be deferenced using its .pointee property
- 15. Descriptive Pointer Types UnsafePointer<T> UnsafeMutablePointer<T> UnsafeBufferPointer<T> UnsafeMutableBufferPointer<T> UnsafeRawPointer UnsafeMutableRawPointer UnsafeRawBufferPointer UnsafeMutableRawBufferPointer <T> or Raw Mutable (or not) Buffer (or not)
- 16. Using OpaquePointers in MongoSwift
- 17. Using UnsafePointers in MongoSwift
- 21. Challenges of C interoperation
- 22. Swift has a powerful type system.
- 24. What is an optional?
- 25. What is an optional? A typed value that is optionally set
- 27. Using Optionals in MongoSwift
- 28. Using Optionals in MongoSwift
- 29. Using Optionals in MongoSwift
- 30. Extensions
- 31. Extensions Add new functionality to existing types
- 33. Protocols • Similar to an interface in other languages - specify a required set of properties and methods • In order to conform to a protocol, a type must implement its requirements
- 37. How to represent BSON values? Double String Document Array Binary ObjectId Boolean Date Regex CodeWithScope Int32 Timestamp Int64 Decimal128 MinKey MaxKey
- 38. How to represent BSON values? Double String Document Array Binary ObjectId Boolean Date Regex CodeWithScope Int32 Timestamp Int64 Decimal128 MinKey MaxKey
- 39. Custom protocols
- 40. Custom types can conform to protocols
- 41. Native types can be extended to conform to protocols
- 42. Protocols can be used as types
- 43. Protocols can be used as types
- 44. Generics
- 45. Generics
- 46. Generics
- 48. Using Generics in MongoSwift
- 49. Challenges of Swift’s type system • Lacking some desired features • Auto-generated Equatable
- 51. Challenges of Swift’s type system • Lacking some desired features • Auto-generated Equatable, Hashable • Default type parameters
- 52. Default Type Parameters maybe someday: now:
- 53. What’s next for the driver? • Implement the full MongoDB CRUD API • Support for MongoDB 4.0 features • Support for more complex DB configurations • Integration with Swift web frameworks • Replace libbson usage with native Swift
- 54. In summary… • Swift is new and exciting! • Swift has a powerful type system: protocols, extensions, generics, optionals, and more. • Swift interoperates easily with C. • You should try writing Swift!
- 55. Want to learn more? Today: 3:30pm MongoDB Mobile talk On your own: The Swift Programming Language (by Apple, free) objc.io videos and books Swift by Sundell (blog)
- 56. Kaitlin Mahar Drivers Engineer @ MongoDB @k__mahar @kmahar