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Developing mobile apps with f sharp

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Transcript

  • 1. Developing mobile apps with F# Gustavo Guerra F#unctional Londoners Meetup Group
  • 2. Developing mobile apps with F# • App Demos • Why F# • F# & Mobile Platforms • Tips &Tricks
  • 3. Learn OnThe Go UKTrains Demo
  • 4. Why F#? • Functional First • Immutability by default • Powerful functional abstractions (LINQ+++) • StrongType System • Friends don't let friends use null • Option type • Whole class hierarchies in handful of lines • Discriminated unions • Record types
  • 5. Why F#? • Powerful but Light Syntax • Significant whitespace • Everything is an expression • Pattern matching • Type Inference • Almost feels like a dynamic language like python • Easier to Understand • Declarative feel • Explicit compilation order • Signature files
  • 6. Why F#? • REPL • Testability • More productive than compile-run cycle • Similar to dynamic languages (Python, Ruby, etc…) • All your types are belong to us • Type Providers
  • 7. Why F#? • Very goodAsync support • What’s in C# 4.5 • More composable • Built-in cancellation!!! • Started explicitly • http://tomasp.net/blog/csharp-async-gotchas.aspx
  • 8. Windows 8 /Windows Phone 8 • No support forWinRT /WinPRT in F# • View has to be done in C# • F# only available through Portable Class Library • MVVM doesn’t work as well as inWPF • Data binding works ok-ish • Reflection doesn’t work on erased type providers • ICustomTypeDescriptor & similars not accessible from F# PCL • F# compilation toWinJS • http://funscript.info/ • http://www.websharper.com
  • 9. Windows Phone 7 • Almost everything can be done in F# • Still need wrapper C# project • FSharp.Core 4.0 (noType Providers) • No PCL support • Xamarin.iOS / Xamarin.Android • Also allows view to be done in F# • Type Providers currently don’t work, but this will probably improve
  • 10. Tips &Tricks • Create F# wrappers tuned for currying & partial application • LazyAsync • Interfaces to access view elements • Data Binding • Match functions • Option type doesn’t behave like regular DUs • override x.ToString() = sprintf "%A" x
  • 11. Q & A • SourceCode • http://github.com/ovatsus/LearnOnTheGo • http://github.com/ovatsus/UKTrains