Thinking in F#

Thinking in F#

• 1.
  Thinking in F# MikeClement @mdclement mike@softwareontheside.com http://blog.softwareontheside.com
• 2.
  XP Simple Design •Passesall tests •Clear, expressive, consistent •No duplication •Minimal
• 3.
  FizzBuzz • If multipleof 3, get “Fizz” • If multiple of 5, get “Buzz” • If not, return input int as string • Rules are in order
• 4.
  FizzBuzz Code
• 5.
  Currying/Partial function application letMultiples divisor result x s = if x % divisor = 0 then s + result else s let Fizzy = Multiples 3 "Fizz" val Multiples : divisor:int -> result:string -> x:int -> s:string -> string val Fizzy : (int -> string -> string) let Fizzy x s = if x % 3 = 0 then s + "Fizz" else s
• 6.
  Bowling Game Kata Thegame consists of 10 frames as shown above. In each frame the player has two opportunities to knock down 10 pins. The score for the frame is the total number of pins knocked down, plus bonuses for strikes and spares. A spare is when the player knocks down all 10 pins in two tries. The bonus for that frame is the number of pins knocked down by the next roll. So in frame 3 above, the score is 10 (the total number knocked down) plus a bonus of 5 (the number of pins knocked down on the next roll.) A strike is when the player knocks down all 10 pins on his first try. The bonus for that frame is the value of the next two balls rolled. In the tenth frame a player who rolls a spare or strike is allowed to roll the extra balls to complete the frame. However no more than three balls can be rolled in tenth frame.
• 7.
  Bowling Game –The OO Way
• 8.
  Bowling Game How dowe get more functional?
• 9.
  Lists [1, 2, 3,4] Head Tail
• 10.
  Lists [1, 2, 3,4].Head = 1 [1, 2, 3, 4].Tail = [2, 3, 4] [1, 2, 3, 4].Tail.Tail = [3, 4]
• 11.
  F# Resources • http://en.wikibooks.org/wiki/F_Sharp_Programming •F# for C# Developers by Tao Liu • http://www.tryfsharp.org/ • https://github.com/ChrisMarinos/FSharpKoans
• 12.
  Mike Clement • @mdclement •mike@softwareontheside.com • http://blog.softwareontheside.com • https://github.com/mdclement • http://agilecodegames.com • Utah Software Craftsmanship • http://utahsc.org • @utahsc • We meet the first Wednesday at SLCC