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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Introduction to F#</title>
<meta name="description" content="Introduction to FSharp">
<meta name="author" content="Pierre Irrmann">
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<body>
<div class="reveal">
<div class="tip" id="fs1">Multiple items<br />module List<br /><br />from Microsoft.FSharp.Collections<br /><br />--------------------<br />type List<'T> =<br />  | ( [] )<br />  | ( :: ) of Head: 'T * Tail: 'T list<br />  interface IEnumerable<br />  interface IEnumerable<'T><br />  member Head : 'T<br />  member IsEmpty : bool<br />  member Item : index:int -> 'T with get<br />  member Length : int<br />  member Tail : 'T list<br />  static member Cons : head:'T * tail:'T list -> 'T list<br />  static member Empty : 'T list<br /><br />Full name: Microsoft.FSharp.Collections.List<_></div>
<div class="tip" id="fs2">val sum : list:'T list -> 'T (requires member ( + ) and member get_Zero)<br /><br />Full name: Microsoft.FSharp.Collections.List.sum</div>
<div class="tip" id="fs3">val printfn : format:Printf.TextWriterFormat<'T> -> 'T<br /><br />Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.printfn</div>
<div class="tip" id="fs4">val square : x:int -> int<br /><br />Full name: Document.square</div>
<div class="tip" id="fs5">val x : int</div>
<div class="tip" id="fs6">val sq : int<br /><br />Full name: Document.sq</div>
<div class="tip" id="fs7">type Person =<br />  {First: string;<br />   Last: string;}<br /><br />Full name: Document.Person</div>
<div class="tip" id="fs8">Person.First: string</div>
<div class="tip" id="fs9">Multiple items<br />val string : value:'T -> string<br /><br />Full name: Microsoft.FSharp.Core.Operators.string<br /><br />--------------------<br />type string = System.String<br /><br />Full name: Microsoft.FSharp.Core.string</div>
<div class="tip" id="fs10">Person.Last: string</div>
<div class="tip" id="fs11">type Employee =<br />  | Worker of Person<br />  | Manager of Employee list<br /><br />Full name: Document.Employee</div>
<div class="tip" id="fs12">union case Employee.Worker: Person -> Employee</div>
<div class="tip" id="fs13">union case Employee.Manager: Employee list -> Employee</div>
<div class="tip" id="fs14">type 'T list = List<'T><br /><br />Full name: Microsoft.FSharp.Collections.list<_></div>
<div class="tip" id="fs15">val jdoe : Person<br /><br />Full name: Document.jdoe</div>
<div class="tip" id="fs16">val worker : Employee<br /><br />Full name: Document.worker</div>
<div class="tip" id="fs17">val person1 : Person<br /><br />Full name: Document.person1</div>
<div class="tip" id="fs18">val person2 : Person<br /><br />Full name: Document.person2</div>
<div class="tip" id="fs19">val text : string<br /><br />Full name: Document.text</div>
<div class="tip" id="fs20">val sprintf : format:Printf.StringFormat<'T> -> 'T<br /><br />Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.sprintf</div>
<div class="tip" id="fs21">val add2times3 : (int -> int)<br /><br />Full name: Document.add2times3</div>
<div class="tip" id="fs22">val result : int<br /><br />Full name: Document.result</div>
<div class="tip" id="fs23">val aValue : string<br /><br />Full name: Document.aValue</div>
<div class="tip" id="fs24">val anInt : int<br /><br />Full name: Document.anInt</div>
<div class="tip" id="fs25">val aDouble : float<br /><br />Full name: Document.aDouble</div>
<div class="tip" id="fs26">val aDecimal : decimal<br /><br />Full name: Document.aDecimal</div>
<div class="tip" id="fs27">val a : int<br /><br />Full name: Document.a</div>
<div class="tip" id="fs28">val mutable b : int<br /><br />Full name: Document.b</div>
<div class="tip" id="fs29">val aList : int list<br /><br />Full name: Document.aList</div>
<div class="tip" id="fs30">val anotherList : int list<br /><br />Full name: Document.anotherList</div>
<div class="tip" id="fs31">val areListEqual : bool<br /><br />Full name: Document.areListEqual</div>
<div class="tip" id="fs32">val listSyntax : int list<br /><br />Full name: Document.listSyntax</div>
<div class="tip" id="fs33">val arraySyntax : int []<br /><br />Full name: Document.arraySyntax</div>
<div class="tip" id="fs34">val sequenceSyntax : seq<int><br /><br />Full name: Document.sequenceSyntax</div>
<div class="tip" id="fs35">Multiple items<br />val seq : sequence:seq<'T> -> seq<'T><br /><br />Full name: Microsoft.FSharp.Core.Operators.seq<br /><br />--------------------<br />type seq<'T> = System.Collections.Generic.IEnumerable<'T><br /><br />Full name: Microsoft.FSharp.Collections.seq<_></div>
<div class="tip" id="fs36">val aTuple : int * float * string<br /><br />Full name: Document.aTuple</div>
<div class="tip" id="fs37">val tupleFirstVal : int<br /><br />Full name: Document.tupleFirstVal</div>
<div class="tip" id="fs38">val tupleSecondVal : float<br /><br />Full name: Document.tupleSecondVal</div>
<div class="tip" id="fs39">val tupleThirdVal : string<br /><br />Full name: Document.tupleThirdVal</div>
<div class="tip" id="fs40">type Country =<br />  {Name: string;<br />   CapitalCity: string;<br />   Population: int;}<br /><br />Full name: Document.Country</div>
<div class="tip" id="fs41">Country.Name: string</div>
<div class="tip" id="fs42">Country.CapitalCity: string</div>
<div class="tip" id="fs43">Country.Population: int</div>
<div class="tip" id="fs44">Multiple items<br />val int : value:'T -> int (requires member op_Explicit)<br /><br />Full name: Microsoft.FSharp.Core.Operators.int<br /><br />--------------------<br />type int = int32<br /><br />Full name: Microsoft.FSharp.Core.int<br /><br />--------------------<br />type int<'Measure> = int<br /><br />Full name: Microsoft.FSharp.Core.int<_></div>
<div class="tip" id="fs45">val france : Country<br /><br />Full name: Document.france</div>
<div class="tip" id="fs46">val alternateFrance : Country<br /><br />Full name: Document.alternateFrance</div>
<div class="tip" id="fs47">val format : country:Country -> string<br /><br />Full name: Document.format</div>
<div class="tip" id="fs48">val country : Country</div>
<div class="tip" id="fs49">val add : x:int -> y:int -> int<br /><br />Full name: Document.add</div>
<div class="tip" id="fs50">val y : int</div>
<div class="tip" id="fs51">val add2 : x:int * y:int -> int<br /><br />Full name: Document.add2</div>
<div class="tip" id="fs52">val increasePop : increment:int -> country:Country -> Country<br /><br />Full name: Document.increasePop</div>
<div class="tip" id="fs53">val increment : int</div>
<div class="tip" id="fs54">val rename : newName:string -> country:Country -> Country<br /><br />Full name: Document.rename</div>
<div class="tip" id="fs55">val newName : string</div>
<div class="tip" id="fs56">val giveBirth : (Country -> Country)<br /><br />Full name: Document.giveBirth</div>
<div class="tip" id="fs57">val biggerFrance : Country<br /><br />Full name: Document.biggerFrance</div>
<div class="tip" id="fs58">val test1 : Country<br /><br />Full name: Document.test1</div>
<div class="tip" id="fs59">val composition : (Country -> Country)<br /><br />Full name: Document.composition</div>
<div class="tip" id="fs60">val test2 : Country<br /><br />Full name: Document.test2</div>
<div class="tip" id="fs61">val areCountryEqual : bool<br /><br />Full name: Document.areCountryEqual</div>
<div class="tip" id="fs62">type Delivery =<br />  | Cash<br />  | Physical<br /><br />Full name: Document.Delivery</div>
<div class="tip" id="fs63">union case Delivery.Cash: Delivery</div>
<div class="tip" id="fs64">union case Delivery.Physical: Delivery</div>
<div class="tip" id="fs65">type ContactType =<br />  | Phone of string<br />  | Email of string<br /><br />Full name: Document.ContactType</div>
<div class="tip" id="fs66">union case ContactType.Phone: string -> ContactType</div>
<div class="tip" id="fs67">union case ContactType.Email: string -> ContactType</div>
<div class="tip" id="fs68">type Amount = decimal<br /><br />Full name: Document.Amount</div>
<div class="tip" id="fs69">Multiple items<br />val decimal : value:'T -> decimal (requires member op_Explicit)<br /><br />Full name: Microsoft.FSharp.Core.Operators.decimal<br /><br />--------------------<br />type decimal = System.Decimal<br /><br />Full name: Microsoft.FSharp.Core.decimal<br /><br />--------------------<br />type decimal<'Measure> = decimal<br /><br />Full name: Microsoft.FSharp.Core.decimal<_></div>
<div class="tip" id="fs70">type Discount =<br />  | Percentage of decimal<br />  | Absolute of Amount<br />  | Limited of discount: Discount * limit: Amount<br /><br />Full name: Document.Discount</div>
<div class="tip" id="fs71">union case Discount.Percentage: decimal -> Discount</div>
<div class="tip" id="fs72">union case Discount.Absolute: Amount -> Discount</div>
<div class="tip" id="fs73">union case Discount.Limited: discount: Discount * limit: Amount -> Discount</div>
<div class="tip" id="fs74">Multiple items<br />union case Tree.Tree: Tree<'T> * Tree<'T> -> Tree<'T><br /><br />--------------------<br />type Tree<'T> =<br />  | Node of 'T<br />  | Tree of Tree<'T> * Tree<'T><br /><br />Full name: Document.Tree<_></div>
<div class="tip" id="fs75">union case Tree.Node: 'T -> Tree<'T></div>
<div class="tip" id="fs76">val aTree : Tree<int><br /><br />Full name: Document.aTree</div>
<div class="tip" id="fs77">Multiple items<br />module Option<br /><br />from Microsoft.FSharp.Core<br /><br />--------------------<br />type Option<'T> =<br />  | Some of 'T<br />  | None<br /><br />Full name: Document.Option<_></div>
<div class="tip" id="fs78">union case Option.Some: 'T -> Option<'T></div>
<div class="tip" id="fs79">union case Option.None: Option<'T></div>
<div class="tip" id="fs80">val aResult : Option<string><br /><br />Full name: Document.aResult</div>
<div class="tip" id="fs81">val nothing : Option<'a><br /><br />Full name: Document.nothing</div>
<div class="tip" id="fs82">val serialize : tree:Tree<'a> -> string<br /><br />Full name: Document.serialize</div>
<div class="tip" id="fs83">val tree : Tree<'a></div>
<div class="tip" id="fs84">val left : Tree<'a></div>
<div class="tip" id="fs85">val right : Tree<'a></div>
<div class="tip" id="fs86">val value : 'a</div>
<div class="tip" id="fs87">System.Object.ToString() : string</div>
<div class="tip" id="fs88">val serializedTree : string<br /><br />Full name: Document.serializedTree</div>
<div class="tip" id="fs89">val cut : tree:Tree<'a> -> Tree<'a><br /><br />Full name: Document.cut</div>
<div class="tip" id="fs90">val cutTree : string<br /><br />Full name: Document.cutTree</div>
<div class="tip" id="fs91">Multiple items<br />type ParsedValue<'T> =<br />  new : tag:int * value:'T -> ParsedValue<'T><br />  member GetValueType : unit -> Type<br />  override ToString : unit -> string<br />  member Tag : int<br />  member Value : 'T<br /><br />Full name: Document.ParsedValue<_><br /><br />--------------------<br />new : tag:int * value:'T -> ParsedValue<'T></div>
<div class="tip" id="fs92">val tag : int</div>
<div class="tip" id="fs93">val value : 'T</div>
<div class="tip" id="fs94">val x : ParsedValue<'T></div>
<div class="tip" id="fs95">member ParsedValue.Tag : int<br /><br />Full name: Document.ParsedValue`1.Tag</div>
<div class="tip" id="fs96">member ParsedValue.Value : 'T<br /><br />Full name: Document.ParsedValue`1.Value</div>
<div class="tip" id="fs97">member ParsedValue.GetValueType : unit -> System.Type<br /><br />Full name: Document.ParsedValue`1.GetValueType</div>
<div class="tip" id="fs98">val typeof<'T> : System.Type<br /><br />Full name: Microsoft.FSharp.Core.Operators.typeof</div>
<div class="tip" id="fs99">override ParsedValue.ToString : unit -> string<br /><br />Full name: Document.ParsedValue`1.ToString</div>
<div class="tip" id="fs100">val parsed : ParsedValue<string><br /><br />Full name: Document.parsed</div>
<div class="tip" id="fs101">type IMashable =<br />  interface<br />    abstract member Mash : paramName:string -> string<br />  end<br /><br />Full name: Document.IMashable</div>
<div class="tip" id="fs102">abstract member IMashable.Mash : paramName:string -> string<br /><br />Full name: Document.IMashable.Mash</div>
<div class="tip" id="fs103">val mashable : IMashable<br /><br />Full name: Document.mashable</div>
<div class="tip" id="fs104">val x : IMashable</div>
<div class="tip" id="fs105">abstract member IMashable.Mash : paramName:string -> string</div>
<div class="tip" id="fs106">val s : string</div>
<div class="tip" id="fs107">val seq1 : seq<int><br /><br />Full name: Document.seq1</div>
<div class="tip" id="fs108">val seq1Evaluated : int []<br /><br />Full name: Document.seq1Evaluated</div>
<div class="tip" id="fs109">module Seq<br /><br />from Microsoft.FSharp.Collections</div>
<div class="tip" id="fs110">val toArray : source:seq<'T> -> 'T []<br /><br />Full name: Microsoft.FSharp.Collections.Seq.toArray</div>
<div class="tip" id="fs111">val seq2 : seq<int><br /><br />Full name: Document.seq2</div>
<div class="tip" id="fs112">val seq2Evaluated : int []<br /><br />Full name: Document.seq2Evaluated</div>
<div class="tip" id="fs113">val products : seq<int * int * int><br /><br />Full name: Document.products</div>
<div class="tip" id="fs114">val i : int</div>
<div class="tip" id="fs115">val j : int</div>
<div class="tip" id="fs116">val productsEvaluated : (int * int * int) []<br /><br />Full name: Document.productsEvaluated</div>
<div class="tip" id="fs117">val sortedEvenProducts : seq<int * int * int><br /><br />Full name: Document.sortedEvenProducts</div>
<div class="tip" id="fs118">val filter : predicate:('T -> bool) -> source:seq<'T> -> seq<'T><br /><br />Full name: Microsoft.FSharp.Collections.Seq.filter</div>
<div class="tip" id="fs119">val sortBy : projection:('T -> 'Key) -> source:seq<'T> -> seq<'T> (requires comparison)<br /><br />Full name: Microsoft.FSharp.Collections.Seq.sortBy</div>
<div class="tip" id="fs120">val sortedEvenProductsEvaluated : (int * int * int) []<br /><br />Full name: Document.sortedEvenProductsEvaluated</div>
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h1>Introduction to F#</h1>
<p>Pierre Irrmann / @pirrmann</p>
<p>"C# dev, F# addict"</p>
</section>
<section>
<p><img src="./images/fsharp-ug-paris.png" alt="F# Paris User Group" title="F# Paris User Group" /></p>
<p>@FSharpParis</p>
</section>
<section>
<section>
<h2>F# big picture</h2>
<ul>
<li>Functional-first language that runs on the CLR</li>
<li>Interoperable with all the exisiting .NET ecosystem</li>
<li>Very low noise/signal ratio</li>
<li>Open-source compiler written in F#</li>
<li>Wonderful community!</li>
</ul>
</section>
<section>
<h2>Functional?</h2>
<ul>
<li>Functions and Types over classes</li>
<li>Purity over mutability</li>
<li>Composition over inheritance</li>
<li>Higher order functions over method dispatch</li>
<li>Options over nulls</li>
</ul>
<p><a href="http://www.notonlyoo.org">www.notonlyoo.org</a></p>
</section>
</section>
<section>
<section>
<h2>Why F#?</h2>
<ul>
<li>Conciseness</li>
<li>Convenience</li>
<li>Correctness</li>
<li>Concurrency</li>
<li>Completeness</li>
</ul>
<p><a href="http://fsharpforfunandprofit.com/why-use-fsharp/"><a href="http://fsharpforfunandprofit.com/why-use-fsharp/">http://fsharpforfunandprofit.com/why-use-fsharp/</a></a></p>
</section>
<section>
<h3>Conciseness</h3>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l"> 1: </span>
<span class="l"> 2: </span>
<span class="l"> 3: </span>
<span class="l"> 4: </span>
<span class="l"> 5: </span>
<span class="l"> 6: </span>
<span class="l"> 7: </span>
<span class="l"> 8: </span>
<span class="l"> 9: </span>
<span class="l">10: </span>
<span class="l">11: </span>
<span class="l">12: </span>
<span class="l">13: </span>
<span class="l">14: </span>
<span class="l">15: </span>
<span class="l">16: </span>
<span class="l">17: </span>
<span class="l">18: </span>
</pre>
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<td class="snippet"><pre class="fssnip">
<span class="c">// one-liners</span>
[<span class="n">1..</span><span class="n">100</span>] <span class="o">|></span> <span onmouseout="hideTip(event, 'fs1', 1)" onmouseover="showTip(event, 'fs1', 1)" class="i">List</span><span class="o">.</span><span onmouseout="hideTip(event, 'fs2', 2)" onmouseover="showTip(event, 'fs2', 2)" class="i">sum</span> <span class="o">|></span> <span onmouseout="hideTip(event, 'fs3', 3)" onmouseover="showTip(event, 'fs3', 3)" class="i">printfn</span> <span class="s">"</span><span class="s">sum</span><span class="s">=</span><span class="s">%</span><span class="s">d</span><span class="s">"</span>
<span class="c">// no curly braces, semicolons or parentheses</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs4', 4)" onmouseover="showTip(event, 'fs4', 4)" class="i">square</span> <span onmouseout="hideTip(event, 'fs5', 5)" onmouseover="showTip(event, 'fs5', 5)" class="i">x</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs5', 6)" onmouseover="showTip(event, 'fs5', 6)" class="i">x</span> <span class="o">*</span> <span onmouseout="hideTip(event, 'fs5', 7)" onmouseover="showTip(event, 'fs5', 7)" class="i">x</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs6', 8)" onmouseover="showTip(event, 'fs6', 8)" class="i">sq</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs4', 9)" onmouseover="showTip(event, 'fs4', 9)" class="i">square</span> <span class="n">42</span>
<span class="c">// simple types in one line</span>
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs7', 10)" onmouseover="showTip(event, 'fs7', 10)" class="i">Person</span> <span class="o">=</span> {<span onmouseout="hideTip(event, 'fs8', 11)" onmouseover="showTip(event, 'fs8', 11)" class="i">First</span><span class="o">:</span><span onmouseout="hideTip(event, 'fs9', 12)" onmouseover="showTip(event, 'fs9', 12)" class="i">string</span>; <span onmouseout="hideTip(event, 'fs10', 13)" onmouseover="showTip(event, 'fs10', 13)" class="i">Last</span><span class="o">:</span><span onmouseout="hideTip(event, 'fs9', 14)" onmouseover="showTip(event, 'fs9', 14)" class="i">string</span>}
<span class="c">// complex types in a few lines</span>
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs11', 15)" onmouseover="showTip(event, 'fs11', 15)" class="i">Employee</span> <span class="o">=</span>
| <span onmouseout="hideTip(event, 'fs12', 16)" onmouseover="showTip(event, 'fs12', 16)" class="i">Worker</span> <span class="k">of</span> <span onmouseout="hideTip(event, 'fs7', 17)" onmouseover="showTip(event, 'fs7', 17)" class="i">Person</span>
| <span onmouseout="hideTip(event, 'fs13', 18)" onmouseover="showTip(event, 'fs13', 18)" class="i">Manager</span> <span class="k">of</span> <span onmouseout="hideTip(event, 'fs11', 19)" onmouseover="showTip(event, 'fs11', 19)" class="i">Employee</span> <span onmouseout="hideTip(event, 'fs14', 20)" onmouseover="showTip(event, 'fs14', 20)" class="i">list</span>
<span class="c">// type inference</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs15', 21)" onmouseover="showTip(event, 'fs15', 21)" class="i">jdoe</span> <span class="o">=</span> {<span class="i">First</span><span class="o">=</span><span class="s">"</span><span class="s">John</span><span class="s">"</span>;<span class="i">Last</span><span class="o">=</span><span class="s">"</span><span class="s">Doe</span><span class="s">"</span>}
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs16', 22)" onmouseover="showTip(event, 'fs16', 22)" class="i">worker</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs12', 23)" onmouseover="showTip(event, 'fs12', 23)" class="i">Worker</span> <span onmouseout="hideTip(event, 'fs15', 24)" onmouseover="showTip(event, 'fs15', 24)" class="i">jdoe</span></pre>
</td>
</tr>
</table>
</section>
<section>
<h3>Convenience</h3>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="c">// automatic equality and comparison</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs17', 25)" onmouseover="showTip(event, 'fs17', 25)" class="i">person1</span> <span class="o">=</span> {<span class="i">First</span><span class="o">=</span><span class="s">"</span><span class="s">john</span><span class="s">"</span>; <span class="i">Last</span><span class="o">=</span><span class="s">"</span><span class="s">Doe</span><span class="s">"</span>}
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs18', 26)" onmouseover="showTip(event, 'fs18', 26)" class="i">person2</span> <span class="o">=</span> {<span class="i">First</span><span class="o">=</span><span class="s">"</span><span class="s">john</span><span class="s">"</span>; <span class="i">Last</span><span class="o">=</span><span class="s">"</span><span class="s">Doe</span><span class="s">"</span>}
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs19', 27)" onmouseover="showTip(event, 'fs19', 27)" class="i">text</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs20', 28)" onmouseover="showTip(event, 'fs20', 28)" class="i">sprintf</span> <span class="s">"</span><span class="s">Equal</span><span class="s">?</span><span class="s"> </span><span class="s">%</span><span class="s">A</span><span class="s">"</span> (<span onmouseout="hideTip(event, 'fs17', 29)" onmouseover="showTip(event, 'fs17', 29)" class="i">person1</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs18', 30)" onmouseover="showTip(event, 'fs18', 30)" class="i">person2</span>)</pre>
</td>
</tr>
</table>
<table class="pre"><tr><td><pre><code>"Equal? true"
</code></pre></td></tr></table>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
</pre>
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<td class="snippet"><pre class="fssnip">
<span class="c">// easy composition of functions</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs21', 31)" onmouseover="showTip(event, 'fs21', 31)" class="i">add2times3</span> <span class="o">=</span> (<span class="o">+</span>) <span class="n">2</span> <span class="o">></span><span class="o">></span> <span class="o">(*)</span> <span class="n">3</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs22', 32)" onmouseover="showTip(event, 'fs22', 32)" class="i">result</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs21', 33)" onmouseover="showTip(event, 'fs21', 33)" class="i">add2times3</span> <span class="n">5</span></pre>
</td>
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</table>
<table class="pre"><tr><td><pre><code>21
</code></pre></td></tr></table>
<p>and the REPL!</p>
</section>
</section>
<section>
<h3>Isn't F# just for math & compilers?</h3>
<p>No.</p>
</section>
<section>
<h2>Main language constructs</h2>
<ul>
<li>Expressions</li>
<li>Lists & collections</li>
<li>Tuples</li>
<li>Record types</li>
<li>Functions</li>
<li>Discriminated Unions</li>
<li>Options</li>
<li>Pattern matching</li>
<li>Classes & Interfaces (yes, really)</li>
<li>Sequence expressions...</li>
<li>... and more!</li>
</ul>
</section>
<section>
<section>
<h3>Basic syntax</h3>
<h4>Let binding</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs23', 34)" onmouseover="showTip(event, 'fs23', 34)" class="i">aValue</span> <span class="o">=</span> <span class="s">"</span><span class="s">hello</span><span class="s"> </span><span class="s">world</span><span class="s">!</span><span class="s">"</span> <span class="c">// with a cool comment</span></pre>
</td>
</tr>
</table>
</section>
<section>
<h3>Basic syntax</h3>
<h4>Type inference for literals</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs24', 35)" onmouseover="showTip(event, 'fs24', 35)" class="i">anInt</span> <span class="o">=</span> <span class="n">1</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs25', 36)" onmouseover="showTip(event, 'fs25', 36)" class="i">aDouble</span> <span class="o">=</span> <span class="n">1.</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs26', 37)" onmouseover="showTip(event, 'fs26', 37)" class="i">aDecimal</span> <span class="o">=</span> <span class="n">2.5M</span></pre>
</td>
</tr>
</table>
</section>
<section>
<h3>Basic syntax</h3>
<h4>Immutability is the default</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
<span class="l">5: </span>
<span class="l">6: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs27', 38)" onmouseover="showTip(event, 'fs27', 38)" class="i">a</span> <span class="o">=</span> <span class="n">1</span>
<span onmouseout="hideTip(event, 'fs27', 39)" onmouseover="showTip(event, 'fs27', 39)" class="i">a</span> <span class="o">=</span> <span class="n">2</span> <span class="c">// false</span>
<span class="k">let</span> <span class="k">mutable</span> <span onmouseout="hideTip(event, 'fs28', 40)" onmouseover="showTip(event, 'fs28', 40)" class="i">b</span> <span class="o">=</span> <span class="n">1</span>
<span onmouseout="hideTip(event, 'fs28', 41)" onmouseover="showTip(event, 'fs28', 41)" class="i">b</span> <span class="o">=</span> <span class="n">2</span> <span class="c">// still false, what would you expect?</span>
<span onmouseout="hideTip(event, 'fs28', 42)" onmouseover="showTip(event, 'fs28', 42)" class="i">b</span> <span class="o"><-</span> <span class="n">2</span>
<span onmouseout="hideTip(event, 'fs28', 43)" onmouseover="showTip(event, 'fs28', 43)" class="i">b</span> <span class="o">=</span> <span class="n">2</span> <span class="c">// true, now</span></pre>
</td>
</tr>
</table>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="c">// a <- 2 doesn't compile, by the way</span></pre>
</td>
</tr>
</table>
</section>
</section>
<section>
<section>
<h3>List and collections (1)</h3>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs29', 44)" onmouseover="showTip(event, 'fs29', 44)" class="i">aList</span> <span class="o">=</span> [<span class="n">1</span>; <span class="n">2</span>; <span class="n">3</span>; <span class="n">4</span>; <span class="n">5</span>]
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs30', 45)" onmouseover="showTip(event, 'fs30', 45)" class="i">anotherList</span> <span class="o">=</span> <span class="n">1</span> <span class="o">::</span> <span class="n">2</span> <span class="o">::</span> <span class="n">3</span> <span class="o">::</span> <span class="n">4</span> <span class="o">::</span> <span class="n">5</span> <span class="o">::</span> []
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs31', 46)" onmouseover="showTip(event, 'fs31', 46)" class="i">areListEqual</span> <span class="o">=</span> (<span onmouseout="hideTip(event, 'fs29', 47)" onmouseover="showTip(event, 'fs29', 47)" class="i">aList</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs30', 48)" onmouseover="showTip(event, 'fs30', 48)" class="i">anotherList</span>)</pre>
</td>
</tr>
</table>
<p>Are they equal?</p>
<table class="pre"><tr><td><pre><code>true
</code></pre></td></tr></table>
</section>
<section>
<h3>List and collections (2)</h3>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs32', 49)" onmouseover="showTip(event, 'fs32', 49)" class="i">listSyntax</span> <span class="o">=</span> [<span class="n">1</span>; <span class="n">2</span>; <span class="n">3</span>]
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs33', 50)" onmouseover="showTip(event, 'fs33', 50)" class="i">arraySyntax</span> <span class="o">=</span> [|<span class="n">1</span>; <span class="n">2</span>; <span class="n">3</span>|]
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs34', 51)" onmouseover="showTip(event, 'fs34', 51)" class="i">sequenceSyntax</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs35', 52)" onmouseover="showTip(event, 'fs35', 52)" class="i">seq</span> { <span class="k">yield</span> <span class="n">1</span>; <span class="k">yield</span> <span class="n">2</span>; <span class="k">yield</span> <span class="n">3</span> }</pre>
</td>
</tr>
</table>
</section>
</section>
<section>
<h3>Tuples</h3>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs36', 53)" onmouseover="showTip(event, 'fs36', 53)" class="i">aTuple</span> <span class="o">=</span> <span class="n">1</span>, <span class="n">1.</span>, <span class="s">"</span><span class="s">one</span><span class="s">"</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs37', 54)" onmouseover="showTip(event, 'fs37', 54)" class="i">tupleFirstVal</span>, <span onmouseout="hideTip(event, 'fs38', 55)" onmouseover="showTip(event, 'fs38', 55)" class="i">tupleSecondVal</span>, <span onmouseout="hideTip(event, 'fs39', 56)" onmouseover="showTip(event, 'fs39', 56)" class="i">tupleThirdVal</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs36', 57)" onmouseover="showTip(event, 'fs36', 57)" class="i">aTuple</span></pre>
</td>
</tr>
</table>
<table class="pre"><tr><td><pre><code>1
</code></pre></td></tr></table>
<table class="pre"><tr><td><pre><code>1.0
</code></pre></td></tr></table>
<table class="pre"><tr><td><pre><code>"one"
</code></pre></td></tr></table>
</section>
<section>
<section>
<h3>Record types (1)</h3>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l"> 1: </span>
<span class="l"> 2: </span>
<span class="l"> 3: </span>
<span class="l"> 4: </span>
<span class="l"> 5: </span>
<span class="l"> 6: </span>
<span class="l"> 7: </span>
<span class="l"> 8: </span>
<span class="l"> 9: </span>
<span class="l">10: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs40', 58)" onmouseover="showTip(event, 'fs40', 58)" class="i">Country</span> <span class="o">=</span> {
<span onmouseout="hideTip(event, 'fs41', 59)" onmouseover="showTip(event, 'fs41', 59)" class="i">Name</span><span class="o">:</span> <span onmouseout="hideTip(event, 'fs9', 60)" onmouseover="showTip(event, 'fs9', 60)" class="i">string</span>
<span onmouseout="hideTip(event, 'fs42', 61)" onmouseover="showTip(event, 'fs42', 61)" class="i">CapitalCity</span><span class="o">:</span> <span onmouseout="hideTip(event, 'fs9', 62)" onmouseover="showTip(event, 'fs9', 62)" class="i">string</span>
<span onmouseout="hideTip(event, 'fs43', 63)" onmouseover="showTip(event, 'fs43', 63)" class="i">Population</span><span class="o">:</span> <span onmouseout="hideTip(event, 'fs44', 64)" onmouseover="showTip(event, 'fs44', 64)" class="i">int</span>
}
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs45', 65)" onmouseover="showTip(event, 'fs45', 65)" class="i">france</span> <span class="o">=</span> {
<span class="i">Name</span> <span class="o">=</span> <span class="s">"</span><span class="s">France</span><span class="s">"</span>
<span class="i">CapitalCity</span> <span class="o">=</span> <span class="s">"</span><span class="s">Paris</span><span class="s">"</span>
<span class="i">Population</span> <span class="o">=</span> <span class="n">66600000</span>
}</pre>
</td>
</tr>
</table>
</section>
<section>
<h3>Record types (2)</h3>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="c">// a new instance</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs46', 66)" onmouseover="showTip(event, 'fs46', 66)" class="i">alternateFrance</span> <span class="o">=</span> { <span onmouseout="hideTip(event, 'fs45', 67)" onmouseover="showTip(event, 'fs45', 67)" class="i">france</span> <span class="k">with</span> <span class="i">Name</span> <span class="o">=</span> <span class="s">"</span><span class="s">AltFrance</span><span class="s">"</span> }</pre>
</td>
</tr>
</table>
<table class="pre"><tr><td><pre><code>{Name = "AltFrance";
CapitalCity = "Paris";
Population = 66600000;}
</code></pre></td></tr></table>
</section>
</section>
<section>
<section>
<h3>Functions (1)</h3>
<h4>(in a functional language, really?)</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
<span class="l">5: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs47', 68)" onmouseover="showTip(event, 'fs47', 68)" class="i">format</span> <span onmouseout="hideTip(event, 'fs48', 69)" onmouseover="showTip(event, 'fs48', 69)" class="i">country</span> <span class="o">=</span>
<span onmouseout="hideTip(event, 'fs20', 70)" onmouseover="showTip(event, 'fs20', 70)" class="i">sprintf</span> <span class="s">"</span><span class="s">%</span><span class="s">s</span><span class="s"> </span><span class="s">has</span><span class="s"> </span><span class="s">a</span><span class="s"> </span><span class="s">total</span><span class="s"> </span><span class="s">poulation</span><span class="s"> </span><span class="s">of</span><span class="s"> </span><span class="s">%</span><span class="s">d</span><span class="s">"</span> <span onmouseout="hideTip(event, 'fs48', 71)" onmouseover="showTip(event, 'fs48', 71)" class="i">country</span><span class="o">.</span><span onmouseout="hideTip(event, 'fs41', 72)" onmouseover="showTip(event, 'fs41', 72)" class="i">Name</span> <span onmouseout="hideTip(event, 'fs48', 73)" onmouseover="showTip(event, 'fs48', 73)" class="i">country</span><span class="o">.</span><span onmouseout="hideTip(event, 'fs43', 74)" onmouseover="showTip(event, 'fs43', 74)" class="i">Population</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs49', 75)" onmouseover="showTip(event, 'fs49', 75)" class="i">add</span> <span onmouseout="hideTip(event, 'fs5', 76)" onmouseover="showTip(event, 'fs5', 76)" class="i">x</span> <span onmouseout="hideTip(event, 'fs50', 77)" onmouseover="showTip(event, 'fs50', 77)" class="i">y</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs5', 78)" onmouseover="showTip(event, 'fs5', 78)" class="i">x</span> <span class="o">+</span> <span onmouseout="hideTip(event, 'fs50', 79)" onmouseover="showTip(event, 'fs50', 79)" class="i">y</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs51', 80)" onmouseover="showTip(event, 'fs51', 80)" class="i">add2</span> (<span onmouseout="hideTip(event, 'fs5', 81)" onmouseover="showTip(event, 'fs5', 81)" class="i">x</span>, <span onmouseout="hideTip(event, 'fs50', 82)" onmouseover="showTip(event, 'fs50', 82)" class="i">y</span>) <span class="o">=</span> <span onmouseout="hideTip(event, 'fs5', 83)" onmouseover="showTip(event, 'fs5', 83)" class="i">x</span> <span class="o">+</span> <span onmouseout="hideTip(event, 'fs50', 84)" onmouseover="showTip(event, 'fs50', 84)" class="i">y</span></pre>
</td>
</tr>
</table>
</section>
<section>
<h3>Functions (2)</h3>
<h4>Types - currying - partial application</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
<span class="l">5: </span>
<span class="l">6: </span>
<span class="l">7: </span>
<span class="l">8: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs52', 85)" onmouseover="showTip(event, 'fs52', 85)" class="i">increasePop</span> <span onmouseout="hideTip(event, 'fs53', 86)" onmouseover="showTip(event, 'fs53', 86)" class="i">increment</span> <span onmouseout="hideTip(event, 'fs48', 87)" onmouseover="showTip(event, 'fs48', 87)" class="i">country</span> <span class="o">=</span>
{ <span onmouseout="hideTip(event, 'fs48', 88)" onmouseover="showTip(event, 'fs48', 88)" class="i">country</span> <span class="k">with</span> <span class="i">Population</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs48', 89)" onmouseover="showTip(event, 'fs48', 89)" class="i">country</span><span class="o">.</span><span onmouseout="hideTip(event, 'fs43', 90)" onmouseover="showTip(event, 'fs43', 90)" class="i">Population</span> <span class="o">+</span> <span onmouseout="hideTip(event, 'fs53', 91)" onmouseover="showTip(event, 'fs53', 91)" class="i">increment</span> }
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs54', 92)" onmouseover="showTip(event, 'fs54', 92)" class="i">rename</span> <span onmouseout="hideTip(event, 'fs55', 93)" onmouseover="showTip(event, 'fs55', 93)" class="i">newName</span> <span onmouseout="hideTip(event, 'fs48', 94)" onmouseover="showTip(event, 'fs48', 94)" class="i">country</span> <span class="o">=</span>
{ <span onmouseout="hideTip(event, 'fs48', 95)" onmouseover="showTip(event, 'fs48', 95)" class="i">country</span> <span class="k">with</span> <span class="i">Name</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs55', 96)" onmouseover="showTip(event, 'fs55', 96)" class="i">newName</span> }
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs56', 97)" onmouseover="showTip(event, 'fs56', 97)" class="i">giveBirth</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs52', 98)" onmouseover="showTip(event, 'fs52', 98)" class="i">increasePop</span> <span class="n">1</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs57', 99)" onmouseover="showTip(event, 'fs57', 99)" class="i">biggerFrance</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs56', 100)" onmouseover="showTip(event, 'fs56', 100)" class="i">giveBirth</span> <span onmouseout="hideTip(event, 'fs45', 101)" onmouseover="showTip(event, 'fs45', 101)" class="i">france</span></pre>
</td>
</tr>
</table>
<p>Welcome to a bigger France!</p>
<table class="pre"><tr><td><pre><code>{Name = "France";
CapitalCity = "Paris";
Population = 66600001;}
</code></pre></td></tr></table>
</section>
<section>
<h3>Functions (3)</h3>
<h4>Piping - composition</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs58', 102)" onmouseover="showTip(event, 'fs58', 102)" class="i">test1</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs45', 103)" onmouseover="showTip(event, 'fs45', 103)" class="i">france</span> <span class="o">|></span> <span onmouseout="hideTip(event, 'fs52', 104)" onmouseover="showTip(event, 'fs52', 104)" class="i">increasePop</span> <span class="n">10000</span> <span class="o">|></span> <span onmouseout="hideTip(event, 'fs54', 105)" onmouseover="showTip(event, 'fs54', 105)" class="i">rename</span> <span class="s">"</span><span class="s">Confédération</span><span class="s"> </span><span class="s">Française</span><span class="s">"</span></pre>
</td>
</tr>
</table>
<table class="pre"><tr><td><pre><code>{Name = "Confédération Française";
CapitalCity = "Paris";
Population = 66610000;}
</code></pre></td></tr></table>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs59', 106)" onmouseover="showTip(event, 'fs59', 106)" class="i">composition</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs52', 107)" onmouseover="showTip(event, 'fs52', 107)" class="i">increasePop</span> <span class="n">10000</span> <span class="o">></span><span class="o">></span> <span onmouseout="hideTip(event, 'fs54', 108)" onmouseover="showTip(event, 'fs54', 108)" class="i">rename</span> <span class="s">"</span><span class="s">Confédération</span><span class="s"> </span><span class="s">Française</span><span class="s">"</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs60', 109)" onmouseover="showTip(event, 'fs60', 109)" class="i">test2</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs45', 110)" onmouseover="showTip(event, 'fs45', 110)" class="i">france</span> <span class="o">|></span> <span onmouseout="hideTip(event, 'fs59', 111)" onmouseover="showTip(event, 'fs59', 111)" class="i">composition</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs61', 112)" onmouseover="showTip(event, 'fs61', 112)" class="i">areCountryEqual</span> <span class="o">=</span> (<span onmouseout="hideTip(event, 'fs58', 113)" onmouseover="showTip(event, 'fs58', 113)" class="i">test1</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs60', 114)" onmouseover="showTip(event, 'fs60', 114)" class="i">test2</span>)</pre>
</td>
</tr>
</table>
<p>Are they equal?</p>
<table class="pre"><tr><td><pre><code>true
</code></pre></td></tr></table>
</section>
</section>
<section>
<section>
<h3>Discriminated Unions (1)</h3>
<h4>Like enums...</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="c">// This just looks like an enum</span>
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs62', 115)" onmouseover="showTip(event, 'fs62', 115)" class="i">Delivery</span> <span class="o">=</span>
| <span onmouseout="hideTip(event, 'fs63', 116)" onmouseover="showTip(event, 'fs63', 116)" class="i">Cash</span>
| <span onmouseout="hideTip(event, 'fs64', 117)" onmouseover="showTip(event, 'fs64', 117)" class="i">Physical</span></pre>
</td>
</tr>
</table>
</section>
<section>
<h3>Discriminated Unions (2)</h3>
<h4>Like enums... on steroids</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="c">// You can embed values</span>
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs65', 118)" onmouseover="showTip(event, 'fs65', 118)" class="i">ContactType</span> <span class="o">=</span>
| <span onmouseout="hideTip(event, 'fs66', 119)" onmouseover="showTip(event, 'fs66', 119)" class="i">Phone</span> <span class="k">of</span> <span onmouseout="hideTip(event, 'fs9', 120)" onmouseover="showTip(event, 'fs9', 120)" class="i">string</span>
| <span onmouseout="hideTip(event, 'fs67', 121)" onmouseover="showTip(event, 'fs67', 121)" class="i">Email</span> <span class="k">of</span> <span onmouseout="hideTip(event, 'fs9', 122)" onmouseover="showTip(event, 'fs9', 122)" class="i">string</span></pre>
</td>
</tr>
</table>
</section>
<section>
<h3>Discriminated Unions (3)</h3>
<h4>Like enums... on steroids</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
<span class="l">5: </span>
<span class="l">6: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="c">// You can embed values... even of different types</span>
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs68', 123)" onmouseover="showTip(event, 'fs68', 123)" class="i">Amount</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs69', 124)" onmouseover="showTip(event, 'fs69', 124)" class="i">decimal</span> <span class="c">// simplified model, no currency</span>
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs70', 125)" onmouseover="showTip(event, 'fs70', 125)" class="i">Discount</span> <span class="o">=</span>
| <span onmouseout="hideTip(event, 'fs71', 126)" onmouseover="showTip(event, 'fs71', 126)" class="i">Percentage</span> <span class="k">of</span> <span onmouseout="hideTip(event, 'fs69', 127)" onmouseover="showTip(event, 'fs69', 127)" class="i">decimal</span>
| <span onmouseout="hideTip(event, 'fs72', 128)" onmouseover="showTip(event, 'fs72', 128)" class="i">Absolute</span> <span class="k">of</span> <span onmouseout="hideTip(event, 'fs68', 129)" onmouseover="showTip(event, 'fs68', 129)" class="i">Amount</span>
| <span onmouseout="hideTip(event, 'fs73', 130)" onmouseover="showTip(event, 'fs73', 130)" class="i">Limited</span> <span class="k">of</span> <span class="i">discount</span><span class="o">:</span><span onmouseout="hideTip(event, 'fs70', 131)" onmouseover="showTip(event, 'fs70', 131)" class="i">Discount</span> <span class="o">*</span> <span class="i">limit</span><span class="o">:</span><span onmouseout="hideTip(event, 'fs68', 132)" onmouseover="showTip(event, 'fs68', 132)" class="i">Amount</span></pre>
</td>
</tr>
</table>
</section>
<section>
<h3>Discriminated Unions (4)</h3>
<h4>Like enums... on steroids</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l"> 1: </span>
<span class="l"> 2: </span>
<span class="l"> 3: </span>
<span class="l"> 4: </span>
<span class="l"> 5: </span>
<span class="l"> 6: </span>
<span class="l"> 7: </span>
<span class="l"> 8: </span>
<span class="l"> 9: </span>
<span class="l">10: </span>
<span class="l">11: </span>
<span class="l">12: </span>
<span class="l">13: </span>
<span class="l">14: </span>
<span class="l">15: </span>
<span class="l">16: </span>
<span class="l">17: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="c">// And of course you can design trees ;)</span>
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs74', 133)" onmouseover="showTip(event, 'fs74', 133)" class="i">Tree</span><span class="o"><</span><span class="o">'</span><span class="i">T</span><span class="o">></span> <span class="o">=</span>
| <span onmouseout="hideTip(event, 'fs75', 134)" onmouseover="showTip(event, 'fs75', 134)" class="i">Node</span> <span class="k">of</span> <span class="o">'</span><span class="i">T</span>
| <span onmouseout="hideTip(event, 'fs74', 135)" onmouseover="showTip(event, 'fs74', 135)" class="i">Tree</span> <span class="k">of</span> <span onmouseout="hideTip(event, 'fs74', 136)" onmouseover="showTip(event, 'fs74', 136)" class="i">Tree</span><span class="o"><</span><span class="o">'</span><span class="i">T</span><span class="o">></span> <span class="o">*</span> <span onmouseout="hideTip(event, 'fs74', 137)" onmouseover="showTip(event, 'fs74', 137)" class="i">Tree</span><span class="o"><</span><span class="o">'</span><span class="i">T</span><span class="o">></span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs76', 138)" onmouseover="showTip(event, 'fs76', 138)" class="i">aTree</span> <span class="o">=</span>
<span onmouseout="hideTip(event, 'fs74', 139)" onmouseover="showTip(event, 'fs74', 139)" class="i">Tree</span>(
<span onmouseout="hideTip(event, 'fs75', 140)" onmouseover="showTip(event, 'fs75', 140)" class="i">Node</span> <span class="n">1</span>,
<span onmouseout="hideTip(event, 'fs74', 141)" onmouseover="showTip(event, 'fs74', 141)" class="i">Tree</span>(
<span onmouseout="hideTip(event, 'fs74', 142)" onmouseover="showTip(event, 'fs74', 142)" class="i">Tree</span>(
<span onmouseout="hideTip(event, 'fs74', 143)" onmouseover="showTip(event, 'fs74', 143)" class="i">Tree</span>(<span onmouseout="hideTip(event, 'fs75', 144)" onmouseover="showTip(event, 'fs75', 144)" class="i">Node</span> <span class="n">2</span>, <span onmouseout="hideTip(event, 'fs75', 145)" onmouseover="showTip(event, 'fs75', 145)" class="i">Node</span> <span class="n">3</span>),
<span onmouseout="hideTip(event, 'fs74', 146)" onmouseover="showTip(event, 'fs74', 146)" class="i">Tree</span>(
<span onmouseout="hideTip(event, 'fs74', 147)" onmouseover="showTip(event, 'fs74', 147)" class="i">Tree</span>(<span onmouseout="hideTip(event, 'fs75', 148)" onmouseover="showTip(event, 'fs75', 148)" class="i">Node</span> <span class="n">4</span>, <span onmouseout="hideTip(event, 'fs75', 149)" onmouseover="showTip(event, 'fs75', 149)" class="i">Node</span> <span class="n">5</span>),
<span onmouseout="hideTip(event, 'fs75', 150)" onmouseover="showTip(event, 'fs75', 150)" class="i">Node</span> <span class="n">6</span>)),
<span onmouseout="hideTip(event, 'fs74', 151)" onmouseover="showTip(event, 'fs74', 151)" class="i">Tree</span>(
<span onmouseout="hideTip(event, 'fs75', 152)" onmouseover="showTip(event, 'fs75', 152)" class="i">Node</span> <span class="n">7</span>,
<span onmouseout="hideTip(event, 'fs74', 153)" onmouseover="showTip(event, 'fs74', 153)" class="i">Tree</span>(<span onmouseout="hideTip(event, 'fs75', 154)" onmouseover="showTip(event, 'fs75', 154)" class="i">Node</span> <span class="n">8</span>, <span onmouseout="hideTip(event, 'fs75', 155)" onmouseover="showTip(event, 'fs75', 155)" class="i">Node</span> <span class="n">9</span>))))</pre>
</td>
</tr>
</table>
</section>
</section>
<section>
<section>
<h3>Options (1)</h3>
<h4>Just a Discriminated Union</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
<span class="l">5: </span>
<span class="l">6: </span>
<span class="l">7: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="c">// defined as</span>
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs77', 156)" onmouseover="showTip(event, 'fs77', 156)" class="i">Option</span><span class="o"><</span><span class="o">'</span><span class="i">T</span><span class="o">></span> <span class="o">=</span>
| <span onmouseout="hideTip(event, 'fs78', 157)" onmouseover="showTip(event, 'fs78', 157)" class="i">Some</span> <span class="k">of</span> <span class="o">'</span><span class="i">T</span>
| <span onmouseout="hideTip(event, 'fs79', 158)" onmouseover="showTip(event, 'fs79', 158)" class="i">None</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs80', 159)" onmouseover="showTip(event, 'fs80', 159)" class="i">aResult</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs78', 160)" onmouseover="showTip(event, 'fs78', 160)" class="i">Some</span> <span class="s">"</span><span class="s">result</span><span class="s">"</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs81', 161)" onmouseover="showTip(event, 'fs81', 161)" class="i">nothing</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs79', 162)" onmouseover="showTip(event, 'fs79', 162)" class="i">None</span></pre>
</td>
</tr>
</table>
</section>
<section>
<h3>Options (2)</h3>
<p>This might seem simple, but that's the reason why YOU DON'T GET ANY NullReferenceException IN F# !</p>
</section>
</section>
<section>
<section>
<h3>Pattern-matching (1)</h3>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
<span class="l">5: </span>
<span class="l">6: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span class="k">rec</span> <span onmouseout="hideTip(event, 'fs82', 163)" onmouseover="showTip(event, 'fs82', 163)" class="i">serialize</span> <span onmouseout="hideTip(event, 'fs83', 164)" onmouseover="showTip(event, 'fs83', 164)" class="i">tree</span> <span class="o">=</span>
<span class="k">match</span> <span onmouseout="hideTip(event, 'fs83', 165)" onmouseover="showTip(event, 'fs83', 165)" class="i">tree</span> <span class="k">with</span>
| <span onmouseout="hideTip(event, 'fs74', 166)" onmouseover="showTip(event, 'fs74', 166)" class="i">Tree</span>(<span onmouseout="hideTip(event, 'fs84', 167)" onmouseover="showTip(event, 'fs84', 167)" class="i">left</span>, <span onmouseout="hideTip(event, 'fs85', 168)" onmouseover="showTip(event, 'fs85', 168)" class="i">right</span>) <span class="k">-></span> <span onmouseout="hideTip(event, 'fs20', 169)" onmouseover="showTip(event, 'fs20', 169)" class="i">sprintf</span> <span class="s">"</span><span class="s">(</span><span class="s">%</span><span class="s">s</span><span class="s">,</span><span class="s"> </span><span class="s">%</span><span class="s">s</span><span class="s">)</span><span class="s">"</span> (<span onmouseout="hideTip(event, 'fs82', 170)" onmouseover="showTip(event, 'fs82', 170)" class="i">serialize</span> <span onmouseout="hideTip(event, 'fs84', 171)" onmouseover="showTip(event, 'fs84', 171)" class="i">left</span>) (<span onmouseout="hideTip(event, 'fs82', 172)" onmouseover="showTip(event, 'fs82', 172)" class="i">serialize</span> <span onmouseout="hideTip(event, 'fs85', 173)" onmouseover="showTip(event, 'fs85', 173)" class="i">right</span>)
| <span onmouseout="hideTip(event, 'fs75', 174)" onmouseover="showTip(event, 'fs75', 174)" class="i">Node</span>(<span onmouseout="hideTip(event, 'fs86', 175)" onmouseover="showTip(event, 'fs86', 175)" class="i">value</span>) <span class="k">-></span> <span onmouseout="hideTip(event, 'fs86', 176)" onmouseover="showTip(event, 'fs86', 176)" class="i">value</span><span class="o">.</span><span onmouseout="hideTip(event, 'fs87', 177)" onmouseover="showTip(event, 'fs87', 177)" class="i">ToString</span>()
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs88', 178)" onmouseover="showTip(event, 'fs88', 178)" class="i">serializedTree</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs82', 179)" onmouseover="showTip(event, 'fs82', 179)" class="i">serialize</span> <span onmouseout="hideTip(event, 'fs76', 180)" onmouseover="showTip(event, 'fs76', 180)" class="i">aTree</span></pre>
</td>
</tr>
</table>
<table class="pre"><tr><td><pre><code>"(1, (((2, 3), ((4, 5), 6)), (7, (8, 9))))"
</code></pre></td></tr></table>
</section>
<section>
<h3>Pattern-matching (2)</h3>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
<span class="l">5: </span>
<span class="l">6: </span>
<span class="l">7: </span>
<span class="l">8: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">let</span> <span class="k">rec</span> <span onmouseout="hideTip(event, 'fs89', 181)" onmouseover="showTip(event, 'fs89', 181)" class="i">cut</span> <span onmouseout="hideTip(event, 'fs83', 182)" onmouseover="showTip(event, 'fs83', 182)" class="i">tree</span> <span class="o">=</span>
<span class="k">match</span> <span onmouseout="hideTip(event, 'fs83', 183)" onmouseover="showTip(event, 'fs83', 183)" class="i">tree</span> <span class="k">with</span>
| <span onmouseout="hideTip(event, 'fs74', 184)" onmouseover="showTip(event, 'fs74', 184)" class="i">Tree</span>(<span onmouseout="hideTip(event, 'fs75', 185)" onmouseover="showTip(event, 'fs75', 185)" class="i">Node</span> _, <span onmouseout="hideTip(event, 'fs85', 186)" onmouseover="showTip(event, 'fs85', 186)" class="i">right</span>) <span class="k">-></span> <span onmouseout="hideTip(event, 'fs89', 187)" onmouseover="showTip(event, 'fs89', 187)" class="i">cut</span> <span onmouseout="hideTip(event, 'fs85', 188)" onmouseover="showTip(event, 'fs85', 188)" class="i">right</span>
| <span onmouseout="hideTip(event, 'fs74', 189)" onmouseover="showTip(event, 'fs74', 189)" class="i">Tree</span>(<span onmouseout="hideTip(event, 'fs84', 190)" onmouseover="showTip(event, 'fs84', 190)" class="i">left</span>, <span onmouseout="hideTip(event, 'fs75', 191)" onmouseover="showTip(event, 'fs75', 191)" class="i">Node</span> _) <span class="k">-></span> <span onmouseout="hideTip(event, 'fs89', 192)" onmouseover="showTip(event, 'fs89', 192)" class="i">cut</span> <span onmouseout="hideTip(event, 'fs84', 193)" onmouseover="showTip(event, 'fs84', 193)" class="i">left</span>
| <span onmouseout="hideTip(event, 'fs74', 194)" onmouseover="showTip(event, 'fs74', 194)" class="i">Tree</span>(<span onmouseout="hideTip(event, 'fs84', 195)" onmouseover="showTip(event, 'fs84', 195)" class="i">left</span>, <span onmouseout="hideTip(event, 'fs85', 196)" onmouseover="showTip(event, 'fs85', 196)" class="i">right</span>) <span class="k">-></span> <span onmouseout="hideTip(event, 'fs74', 197)" onmouseover="showTip(event, 'fs74', 197)" class="i">Tree</span>(<span onmouseout="hideTip(event, 'fs89', 198)" onmouseover="showTip(event, 'fs89', 198)" class="i">cut</span> <span onmouseout="hideTip(event, 'fs84', 199)" onmouseover="showTip(event, 'fs84', 199)" class="i">left</span>, <span onmouseout="hideTip(event, 'fs89', 200)" onmouseover="showTip(event, 'fs89', 200)" class="i">cut</span> <span onmouseout="hideTip(event, 'fs85', 201)" onmouseover="showTip(event, 'fs85', 201)" class="i">right</span>)
| <span onmouseout="hideTip(event, 'fs75', 202)" onmouseover="showTip(event, 'fs75', 202)" class="i">Node</span>(<span onmouseout="hideTip(event, 'fs86', 203)" onmouseover="showTip(event, 'fs86', 203)" class="i">value</span>) <span class="k">-></span> <span onmouseout="hideTip(event, 'fs75', 204)" onmouseover="showTip(event, 'fs75', 204)" class="i">Node</span>(<span onmouseout="hideTip(event, 'fs86', 205)" onmouseover="showTip(event, 'fs86', 205)" class="i">value</span>)
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs90', 206)" onmouseover="showTip(event, 'fs90', 206)" class="i">cutTree</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs76', 207)" onmouseover="showTip(event, 'fs76', 207)" class="i">aTree</span> <span class="o">|></span> <span onmouseout="hideTip(event, 'fs89', 208)" onmouseover="showTip(event, 'fs89', 208)" class="i">cut</span> <span class="o">|></span> <span onmouseout="hideTip(event, 'fs82', 209)" onmouseover="showTip(event, 'fs82', 209)" class="i">serialize</span></pre>
</td>
</tr>
</table>
<table class="pre"><tr><td><pre><code>"((3, 5), 9)"
</code></pre></td></tr></table>
</section>
</section>
<section>
<section>
<h3>Object-oriented constructs (1)</h3>
<h4>Classes</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
<span class="l">5: </span>
<span class="l">6: </span>
<span class="l">7: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs91', 210)" onmouseover="showTip(event, 'fs91', 210)" class="i">ParsedValue</span><span class="o"><</span><span class="o">'</span><span class="i">T</span><span class="o">></span> (<span onmouseout="hideTip(event, 'fs92', 211)" onmouseover="showTip(event, 'fs92', 211)" class="i">tag</span><span class="o">:</span><span onmouseout="hideTip(event, 'fs44', 212)" onmouseover="showTip(event, 'fs44', 212)" class="i">int</span>, <span onmouseout="hideTip(event, 'fs93', 213)" onmouseover="showTip(event, 'fs93', 213)" class="i">value</span><span class="o">:</span><span class="o">'</span><span class="i">T</span>) <span class="o">=</span>
<span class="k">member</span> <span onmouseout="hideTip(event, 'fs94', 214)" onmouseover="showTip(event, 'fs94', 214)" class="i">x</span><span class="o">.</span><span onmouseout="hideTip(event, 'fs95', 215)" onmouseover="showTip(event, 'fs95', 215)" class="i">Tag</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs92', 216)" onmouseover="showTip(event, 'fs92', 216)" class="i">tag</span>
<span class="k">member</span> <span onmouseout="hideTip(event, 'fs94', 217)" onmouseover="showTip(event, 'fs94', 217)" class="i">x</span><span class="o">.</span><span onmouseout="hideTip(event, 'fs96', 218)" onmouseover="showTip(event, 'fs96', 218)" class="i">Value</span> <span class="o">=</span> <span onmouseout="hideTip(event, 'fs93', 219)" onmouseover="showTip(event, 'fs93', 219)" class="i">value</span>
<span class="k">member</span> <span onmouseout="hideTip(event, 'fs94', 220)" onmouseover="showTip(event, 'fs94', 220)" class="i">x</span><span class="o">.</span><span onmouseout="hideTip(event, 'fs97', 221)" onmouseover="showTip(event, 'fs97', 221)" class="i">GetValueType</span>() <span class="o">=</span> <span onmouseout="hideTip(event, 'fs98', 222)" onmouseover="showTip(event, 'fs98', 222)" class="i">typeof</span><span class="o"><</span><span class="o">'</span><span class="i">T</span><span class="o">></span>
<span class="k">override</span> <span onmouseout="hideTip(event, 'fs94', 223)" onmouseover="showTip(event, 'fs94', 223)" class="i">x</span><span class="o">.</span><span onmouseout="hideTip(event, 'fs99', 224)" onmouseover="showTip(event, 'fs99', 224)" class="i">ToString</span>() <span class="o">=</span> <span onmouseout="hideTip(event, 'fs20', 225)" onmouseover="showTip(event, 'fs20', 225)" class="i">sprintf</span> <span class="s">"</span><span class="s">{</span><span class="s">Tag</span><span class="s">:</span><span class="s"> </span><span class="s">%</span><span class="s">d</span><span class="s">;</span><span class="s"> </span><span class="s">Value</span><span class="s">:</span><span class="s"> </span><span class="s">%</span><span class="s">A</span><span class="s">}</span><span class="s">"</span> <span onmouseout="hideTip(event, 'fs92', 226)" onmouseover="showTip(event, 'fs92', 226)" class="i">tag</span> <span onmouseout="hideTip(event, 'fs93', 227)" onmouseover="showTip(event, 'fs93', 227)" class="i">value</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs100', 228)" onmouseover="showTip(event, 'fs100', 228)" class="i">parsed</span> <span class="o">=</span> <span class="k">new</span> <span onmouseout="hideTip(event, 'fs91', 229)" onmouseover="showTip(event, 'fs91', 229)" class="i">ParsedValue</span><span class="o"><</span>_<span class="o">></span>(<span class="n">48</span>, <span class="s">"</span><span class="s">Z</span><span class="s"> </span><span class="s">Z4</span><span class="s">"</span>)</pre>
</td>
</tr>
</table>
</section>
<section>
<h3>Object-oriented constructs (2)</h3>
<h4>Interfaces & object expressions</h4>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>
<span class="l">5: </span>
<span class="l">6: </span>
<span class="l">7: </span>
<span class="l">8: </span>
</pre>
</td>
<td class="snippet"><pre class="fssnip">
<span class="k">type</span> <span onmouseout="hideTip(event, 'fs101', 230)" onmouseover="showTip(event, 'fs101', 230)" class="i">IMashable</span> <span class="o">=</span>
<span class="k">abstract</span> <span onmouseout="hideTip(event, 'fs102', 231)" onmouseover="showTip(event, 'fs102', 231)" class="i">Mash</span><span class="o">:</span> <span class="i">paramName</span><span class="o">:</span><span onmouseout="hideTip(event, 'fs9', 232)" onmouseover="showTip(event, 'fs9', 232)" class="i">string</span> <span class="k">-></span> <span onmouseout="hideTip(event, 'fs9', 233)" onmouseover="showTip(event, 'fs9', 233)" class="i">string</span>
<span class="k">let</span> <span onmouseout="hideTip(event, 'fs103', 234)" onmouseover="showTip(event, 'fs103', 234)" class="i">mashable</span> <span class="o">=</span>
{
<span class="k">new</span> <span onmouseout="hideTip(event, 'fs101', 235)" onmouseover="showTip(event, 'fs101', 235)" class="i">IMashable</span> <span class="k">with</span>
<span class="k">member</span> <span onmouseout="hideTip(event, 'fs104', 236)" onmouseover="showTip(event, 'fs104', 236)" class="i">x</span><span class="o">.</span><span onmouseout="hideTip(event, 'fs105', 237)" onmouseover="showTip(event, 'fs105', 237)" class="i">Mash</span>(<span onmouseout="hideTip(event, 'fs106', 238)" onmouseover="showTip(event, 'fs106', 238)" class="i">s</span><span class="o">:</span><span onmouseout="hideTip(event, 'fs9', 239)" onmouseover="showTip(event, 'fs9', 239)" class="i">string</span>) <span class="o">=</span> <span onmouseout="hideTip(event, 'fs20', 240)" onmouseover="showTip(event, 'fs20', 240)" class="i">sprintf</span> <span class="s">"</span><span class="s">*</span><span class="s">*</span><span class="s">*</span><span class="s">-</span><span class="s">%</span><span class="s">s</span><span class="s">-</span><span class="s">*</span><span class="s">*</span><span class="s">*</span><span class="s">"</span> <span onmouseout="hideTip(event, 'fs106', 241)" onmouseover="showTip(event, 'fs106', 241)" class="i">s</span>
}</pre>
</td>
</tr>
</table>
</section>
</section>
<section>
<section>
<h3>Sequence expressions (1)</h3>
<table class="pre"><tr><td class="lines"><pre class="fssnip">
<span class="l">1: </span>
<span class="l">2: </span>
<span class="l">3: </span>
<span class="l">4: </span>