iOS App Development with F# and Xamarin

iOS App Development with F# and Xamarin

• 1.
  T W IT T E R : @ R A C H E L R E E S E B L O G : R A C H E L R E E . S E G I T H U B : R A C H E L R E E S E iOS App Development with Xamarin and F#
• 2.
  Why F#?
• 3.
  “ ” Y A NC U I L E A D S E R V E R E N G I N E E R , G A M E S Y S ( S O U R C E ) F#…offers us an order of magnitude increase in productivity and allows one developer to perform the work…of a team of dedicated developers on an existing Java-based solution... F# Testimonials
• 4.
  “ ” D A RR E N P L A T T A M Y R I S B I O T E C H N O L O G Y ( S O U R C E ) The UI work is especially gratifying, because state of the art for a lot of genomic data display is still PNG images embedded in JavaScript and with F# I can render half a million data points on a web page without jumping through hoops. F# Testimonials
• 5.
  StartNewGame <| GetNewGameBoard() F#Fundamentals |> Significant whitespace Immutable by default //names is tuple of (name, id) Array.Parallel.partition (fun g -> ids.Contains(snd g)) names |> fst |> Array.toList [1..10] |> List.filter (fun x -> x % 2 = 0) |> List.map (fun x -> x + 3) |> List.sum operaHouses //(Name, Current Productions) for each opera house |> Array.map (fun (x,y) -> x, y |> Seq.toArray)) |> Array.filter (fun (x,y) -> y.Length > 0)
• 6.
  Quote of theWeek blog post Option Types F# Fundamentals
• 7.
  F# C# type Transport= | Car of Make:string * Model:string | Bus of Route:int | Bicycle public abstract class Transport{ } public abstract class Car : Transport { public string Make { get; private set; } public string Model { get; private set; } public Car (string make, string model) { this.Make = make; this.Model = model; } } public abstract class Bus : Transport { public int Route { get; private set; } public Bus (int route) { this.Route = route; } } public class Bicycle: Transport { } ... F# Fundamentals: Concise Code with DUs
• 8.
  F# Fundamentals: PatternMatching type Transport = | Car of Make:string * Model:string | Bus of Route:int | Bicycle let getThereVia (transport:Transport) = match transport with | Car (make,model) -> () | Bus route -> ()
• 9.
  Several reasons whyyou should learn F# Discriminated unions Immutable by default Pattern matching Option type Custom operators REPL
• 10.
  F# vs. Swift ‘Enums’Discriminatedunions Constant or VariableImmutable by default Enhanced switchPattern matching OptionalsOption type Custom operatorsCustom operators REPLREPL
• 11.
  No type providers Lacksfull type inference No units of measure Requires “return” Still void, no unit No parallelism & async! Single platform Young language No easy cloning syntax for structures (e.g. records) Literal data structures are only list and dict Simpler garbage collection process Active Patterns But Swift is still missing out
• 12.
  TYPE PROVIDERS! UNITS OFMEASURE! Why F#?
• 13.
  Some existing type providers. Seehere for a full list. Minesweeper Azure Choose your own adventure Matla b RSS XAML Rock, Paper, Scissors Oracle MVVMCross SignalR FunScript R File System Python Regex CSV World Bank SQLite Don Syme XML Squirrels LINQ IKV M MS Dynamics CRM Freebase JSON SQL Server SQL Server with EF powershell Dates Hadoo p OData WSDL Apiary Facebook
• 14.
  Get data from Hadoop SQL Server SQLite RSS Freebase Oracle CSV OData WorldBank JSON Process with Matlab Powershell Regex R SignalR Python LINQ Visualize with F# Matlab R Get creative.
• 15.
  Why Xamarin? Fully Native Cross Platform
• 16.
  iOS Fundamentals: AppDelegate
• 17.
  iOS Fundamentals: ViewController
• 18.
  Minesweeper
• 19.
  T W IT T E R : @ R A C H E L R E E S E B L O G : R A C H E L R E E . S E G I T H U B : R A C H E L R E E S E iOS App Development with Xamarin and F#