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Слайды и текст этой презентации

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F# Succinct, Expressive, Functional The F# Team Microsoft Developer Division Microsoft Research

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Topics What is F# about? Some Simple F# Programming A Taste of Parallel/Reactive with F#

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What is F# about? Or: Why is Microsoft investing in functional programming anyway?

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Simplicity

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Economics

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Programmer Productivity

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Simplicity

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Code! //F# open System let a = 2 Console.WriteLine a

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Pleasure Pleasure

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Pleasure Pleasure

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Pleasure Pleasure

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Economics

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Programmer Productivity

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People

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F#: Influences

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F#: Combining Paradigms

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F#: The Combination Counts!

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The Path to Mastering F#

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Quick Tour

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Quick Tour

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Orthogonal & Unified Constructs Let “let” simplify your life…

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Demo: Let’s WebCrawl…

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Orthogonal & Unified Constructs Functions: like delegates + unified and simple

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F# - Functional let f x = x+1 let pair x = (x,x) let fst (x,y) = x let data = (Some [1;2;3], Some [4;5;6]) match data with | Some(nums1), Some(nums2) -> nums1 @ nums2 | None, Some(nums) -> nums | Some(nums), None -> nums | None, None -> failwith "missing!"

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F# - Functional List.map Seq.fold Array.filter Lazy.force Set.union Map LazyList Events Async... [ 0..1000 ] [ for x in 0..10 -> (x, x * x) ] [| for x in 0..10 -> (x, x * x) |] seq { for x in 0..10 -> (x, x * x) }

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Immutability the norm…

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In Praise of Immutability Immutable objects can be relied upon Immutable objects can transfer between threads Immutable objects can be aliased safely Immutable objects lead to (different) optimization opportunities

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F# - Lists open System.IO let rec allFiles(dir) = [ for file in Directory.GetFiles(dir) do yield file for sub in Directory.GetDirectories(dir) do yield! allFiles(sub) ] allFiles(@"C:\Demo")

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F# - Sequences open System.IO let rec allFiles(dir) = seq { for file in Directory.GetFiles(dir) do yield file for sub in Directory.GetDirectories(dir) do yield! allFiles(sub) } allFiles(@"C:\WINDOWS") |> Seq.take 100 |> show

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Weakly Typed? Slow? //F# #light open System let a = 2 Console.WriteLine(a)

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Objects

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F# - Objects + Functional type Vector2D(dx:double,dy:double) = member v.DX = dx member v.DY = dy member v.Length = sqrt(dx*dx+dy*dy) member v.Scale(k) = Vector2D(dx*k,dy*k)

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F# - Objects + Functional type Vector2D(dx:double,dy:double) = let norm2 = dx*dx+dy*dy member v.DX = dx member v.DY = dy member v.Length = sqrt(norm2) member v.Norm2 = norm2

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F# - Objects + Functional type HuffmanEncoding(freq:seq) = ... < 50 lines of beautiful functional code> ... member x.Encode(input: seq) = encode(input) member x.Decode(input: seq) = decode(input)

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F# - Objects + Functional type Vector2D(dx:double,dy:double) = let mutable currDX = dx let mutable currDX = dy member v.DX = currDX member v.DY = currDY member v.Move(x,y) = currDX

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F# Async/Parallel

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The Solution Good Architecture Know your techniques Know your requirements Know your limits (CPU, disk, network, latency) Translate Good Architecture into Good Code with F# A great platform A massive increase in isolation and immutability A massive reduction in mutation