DYNAMIC: DONT BE AFRAID Hadi Hariri JetBrains Agenda The What, the - - PowerPoint PPT Presentation

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DYNAMIC: DONT BE AFRAID Hadi Hariri JetBrains Agenda The What, the - - PowerPoint PPT Presentation

Sep 12, 2022 196 likes •858 views

DYNAMIC: DONT BE AFRAID Hadi Hariri JetBrains Agenda The What, the Why, the How A Tale as Old as Time... A tale as old as time Static vs Dynamic Static vs Dynamic Discussion Threads Blog Blog Posts Posts and more blog posts In

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DYNAMIC: DON’T BE AFRAID

Hadi Hariri JetBrains

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The What, the Why, the How

Agenda

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A tale as old as time…

A Tale as Old as Time...

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Static vs Dynamic

Static vs Dynamic

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Blog Posts Discussion Threads Blog Posts and more blog posts

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  • Types can be implicit or explicit (var)
  • Compiler Safety
  • Early Binding

In the Static World

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  • Types defined at runtime
  • No Compiler (Usually)
  • Late Binding
  • Interpreted (Not always)

In a Dynamic World

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What Dynamic Developers think of Static Developers…

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I need my compiler!

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What Static Developers think of Dynamic Developers…

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http://nimblepros.com/products/software-craftsmanship-2012-calendar.aspx

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"You cannot build serious business applications in dynamic languages"

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They both have Good and Bad Things

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DLR & C# 4

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  • dynamic keyword
  • Classes/Binders and interfaces to work with

dynamic types

C# added...

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Hosting API Debugging API Interop Binders Dynamic Objects Call-Site Caching Expressions Expression Compiler / Interpreter IL Code Generator

DLR added…

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DLR IronRuby IronPython C# VB.NET Bindings .NET Ruby Python Office

The Big Picture

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SLIDE 21 http://www.flickr.com/photos/bitjungle
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GET YOUR STINKING DYNAMIC TYPES OFF OF MY STATIC LANGUAGE

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IS THERE A NEED?

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Readability

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Interoperability

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Interoperability with other languages

  • IronPython
  • Interpreted
  • Can be compiled
  • IronRuby
  • Interpreted
  • Your own language
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DEMO

TALKING RUBY

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Interoperability

  • Talking to COM
  • Need a type-library beforehand
  • Use Method Invocation
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DEMO

TALKING COM

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The Case of the DTO

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Creating Dynamic Objects in C#

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Options

  • ExpandObject
  • DynamicObject
  • IDynamicMetaObjectProvider
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Expando Object

  • Built-in Dynamic Object. Works out of the box
  • Benefits over Dictionary
  • More Fluent
  • Support for Methods
  • Supports Hierarchies
  • Implements INotifyPropertyChanged
  • Limitations
  • Index Access
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DEMO

ON THE FLY: BASICS OF DYNAMIC

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DEMO

EXPANDOS

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DynamicObject

  • Moving Beyond an Expando
  • Built-in class which implements

IDynamicMetaObjectProvider

  • Allows easy creation of Dynamic types
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DEMO

MVC – VIEWBAG, DYNAMICOBJECTSIMPLE

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IDynamicMetaObjectProvider

  • Meta Object that performs binding
  • Allows decoupling from class
  • Uses DLR Expressions
  • Returns DynamicObject
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DEMO

DYNAMICPROVIDER

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Undetermined API

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Aspects of MetaProgramming

  • Adding / Removing Methods
  • Creating Instance Methods
  • Creating Static / Class Methods
  • Query Classes
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DEMO

DYNAMICMETHODMISSING – SIMPLE DATA

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Consuming the ever-changing

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DEMO

CONSUMINGJSON

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DSL's and Fluent API's

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A QUICK LOOK UNDER THE HOOD…

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The backbone of dynamic support

DLR

Language Semantics via DLR EXpression Define Late Binding Logic

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DLR Expression

  • Superset of Linq.Expression
  • Common to multiple Languages
  • DLR Expression is to DLR Languages what IL

is to CLR languages

C#

VB.NET

IL CLR IronPython IronRuby DLR Expression DLR Runtime

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Late Binding

  • We only know the types at runtime
  • We have to figure out how to call those

methods at runtime

  • It’s not embedded in the “IL”
  • It’s potentially slower
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Late Binding

  • Using Binders and Call Sites
  • Using Dynamic Expression (uses former

internally)

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Late Binding

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DEMO

DYNAMICCONVERSION

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SUMMING UP…

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The Disadvantages

  • There is no compile type-checking*
  • Potentially slower (even with caching)
  • There is no Intellisense*

* Partially incorrect – It’s about the tooling

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Reasons to not not use dynamic

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Reasons to not not use dynamic

  • There’s no compiler
  • There’s no intellisense (Emphasis on Unit Tests)
  • You shouldn’t mix dynamic and static languages
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Reasons to use dynamic

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Reasons to use Dynamic

  • Interoperability
  • COM
  • Consuming Dynamic Languages
  • Ruby
  • JavaScript
  • Fluent API’s and DSL
  • Consuming the *unknown*
  • Dynamic Structures
  • Avoiding unnecessary “class explosion”
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Thank you