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--- projects:fsharp_workshop [2015/04/17 21:35] – mkucia
+++ projects:fsharp_workshop [2015/04/18 17:32] – mkucia
@@ Line 1: / Line 1: @@
 ====== F# workshop ======
+{{:projects:fsharp_logo.png?nolink|}}
+===== Prerequisites =====
+    * https://www.linqpad.net/ or anything that can execute a REPL((Read, Evaluate, Print Loop))
+<hidden ↘ alternatives>
+    * Try F# in browser: http://www.tryfsharp.org/Create
+    * Use Visual Studio https://www.visualstudio.com/
+    * Get a full distribution: http://fsharp.org/use/windows/ OR http://fsharp.org/use/linux/
+</hidden>
+===== Agenda =====
-  * f(x) = Hello_Word
+  * hello(x)
   * Type providers (strongly typed)
   * Matching
   * Options
-===== How to use? Where to get? =====
-Try F# in browser:
-http://www.tryfsharp.org/Create
-Want to get a full distribution?
+===== hello(x) =====
-http://fsharp.org/ → Use F#
-===== [Hello] =====
 <code fsharp>
 let hello = printf "Hello World"
+hello
 </code>
-===== Why? =====
+F# (pronounced “F Sharp”) is
 <WRAP group>
 <WRAP half column box>
-Pros:
   * Open Source
-  * Multi platform (Mono, .NET core)
+  * Multi platform
   * Modern, rising popularity
-  * Lazy evaluation
+  * Lazy evaluated
   * Reusable
-  * Reduced code
+  * Concise (See [[http://theburningmonk.com/2014/12/seven-ineffective-coding-habits-many-f-programmers-dont-have/|signal-to-noise ratio]])
   * Strongly typed
+  * Functional first
+    * Use functional to write easy to test and understand code
+    * Use imperative for performance and compatibility
+    * Use objective for organization and encapsulation
+  * Compiled
 </WRAP>
 <WRAP half column box>
-Cons:
   * Not suitable for real time (unpredictable performance)
-  * Different thinking process (you need to re-learn)
+  * Hard to optimize (Functional languages fundamentally don't model how your computer works)
+  * Functional first (different thinking process, you will need to re-learn)
 </WRAP>
 </WRAP>
+programming language for writing simple code to solve complex problems.
+<code fsharp>
+let hello x = printfn "Hello %s" x
+hello "world"
+</code>
+Introducing pipeline operator:
+<code fsharp>
+let hello x = printfn "Hello %s" x
+"World" |> hello
+</code>
+<hidden pipeline operator definition>
+How to define the operator?
+<code fsharp>
+let inline (|>) x f = f x
+</code>
+</hidden>
+<code fsharp>
+let square x = x * x
+let subtract x y = x - y
+</code>
+<code fsharp>
+let ``complicated stuff`` x =
+    printfn "%d" (add 5 (square x))
+</code>
+<code fsharp>
+let ``another complicated stuff`` x =
+    x |> square |> subtract 5 |> printfn "%d"
+</code>
+<code fsharp>
+let equation x =
+	x
+	|> (fun y -> y * y )
+	|> (fun y z -> y - z ) 5
+	|> printfn "%d"
+</code>
-<hidden ↘ C# equivalent>Since you want to know more, here is an explanation with more details […]</hidden>
+Note that F# uses indentation to indicate block structure. Find out more [[http://fsharpforfunandprofit.com/posts/fsharp-syntax/|here]].
-===== Pitfalls and drawbacks =====
-Functional languages fundamentally don't model how your computer works.
-Harder to optimize.
 ===== References =====