F# and the DLR
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F# and the DLR
- 1. F# AND THE DLR Richard Minerich Senior Researcher at Bayard Rock F# MVP of the Year RichardMinerich.com
- 2. The tools we use have a profound (and devious!) influence on our thinking habits, and, therefore, on our thinking abilities. -- Edsger Dijkstra
- 4. F# vs Dynamic F# Dynamic Languages Constructs conform to types and are fixed at runtime Types conform to constructs and change at runtime Data is immutable by default Generally data is mutable by default Protection from many kinds of mistakes No protection, even from typos Native interop with existing .NET Programs and Libraries Some work required for interop, but it’s not difficult Somewhat difficult to learn Very easy to learn
- 6. If you love to code, you’ll love F#. Immutable Data Structures Tail Recursion Discriminated Unions Partial Application Function Composition Quotations Computation Expressions Statically Resolved Type Parameters
- 7. If you hate to code, you’ll love F#
- 8. Functional with Types? Functional + Types
- 10. And has the tools to support it.
- 14. Higher Order Functions Pass Functions into Functions Return Functions from Functions Functions and Values are Interchangeable > let findBestSort list = if List.length list < 1000 then insertionSort else quickSort;; val findBestSort : 'a list -> ('b list -> 'b list) when 'b : comparison Function Function Value Value Function Function Function Value is a
- 21. Try writing some AI http://is.gd/SilverlightAnts
- 22. Try F# at tryfsharp.org
- 24. Read a Book
- 27. Dynamic in C#
- 28. DLR Architecture
- 29. Metaobject Visualization Users and programs interact with metaobjects, not directly with their backing objects as in C#, VB.NET or F#. control create invoke
- 30. Silverlight and the DLR
- 31. Embedded Languages in Your App
- 32. DLR Books and Resources http://www.silverlight.net/learn/dynamic-languages/ http://is.gd/DLRFAQ
Notas do Editor
- C# is OO/Imperative, why is functional important?
- F# has a ton of new constructs to explore and will open your mind to completely new ways of doing things. Things you never thought possible before. You don’t need to understand of this stuff to enjoy F#, but it has a lot to explore if you’re into that kind of thing. Even if you don’t use F# professionally, just learning how these things work will make you a better programmer in general.
- If you care about getting things done quickly, and programming is just a means to an end F# can get you there quickly and safely.
- More, Better, Natively Concurrent Code in Less Time
- F# has a lot of great graphics frameworks. You can make beautiful graphics with very little code. FsChart (left), VSLab (middle top), Tomas’s F# Library for Learning Graphics (top right), Jon Harrop F# for Visualization (bottom right) Tomas’s Graphics Lib: https://github.com/tpetricek/Documents/tree/master/Talks%202011/Teaching%20F%23%20(Community%20for%20F%23)
- It fits together like puzzle pieces.
- You can perform any type of iteration with a recursive function. F# optimizes a special type of recursive functions into loops using a method called tail call optimization. Tail call optimization
- Lambda expressions are great because they reduce our need to make imperative style variable assignments. Small functions can just be included inline.
- Commonly used with higher order functions and lambda expressions
- Sticker question Answer: “Less than ten” Match on types, contents of types, strings, lists…. Very flexible
- This is used to avoid the problem of nulls New values not in a match will cause warnings (or even failure if the compiler is told to do so) They can even be recursive and be used to build strongly typed tree structures
- I wrote an ant colony AI simulation in Silverlight with uploadable AI. Give it a go when you get some time.
- You only need parse and lex your way to an expression tree. The DLR takes care of everything from there.
- Slide care of Kevin Hazzard
- You can write your whole Silverlight application without a single line of compiled code