C# Tricks
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This talk at DevCon 2015 covered several C# tricks including local inversion of control, the maybe monad, dynamic prototyping, and functional animation. It discussed representing presence/absence of values with the maybe monad instead of null, and how to implement monadic application in C# without using workflows as in F#. It also described dynamic prototyping which allows editing a running program without stopping it first.
![Local Inversion of Control
• myList.Add(1)
“myList should add to itself the value 1”
• 1.AddTo(myList)
“take 1 and add to my list”
• op == “AND” || op == “OR” || op == “XOR”
“op is AND or op is OR or …”
• new[]{“AND”,”XOR”,”OR”}.Contains(z)
“a list of elements containing AND, OR, XOR contains…”
• z.IsOneOf(“AND”, “OR”, “XOR”)
self-descriptive](https://image.slidesharecdn.com/msdevconc-151227121043/85/C-Tricks-4-320.jpg)
C# Tricks
- 1. DevCon 2015 developers productivity platform
- 3. In this talk • Local inversion of control • Maybe monad • Dynamic prototyping • Functional animation
- 4. Local Inversion of Control • myList.Add(1) “myList should add to itself the value 1” • 1.AddTo(myList) “take 1 and add to my list” • op == “AND” || op == “OR” || op == “XOR” “op is AND or op is OR or …” • new[]{“AND”,”XOR”,”OR”}.Contains(z) “a list of elements containing AND, OR, XOR contains…” • z.IsOneOf(“AND”, “OR”, “XOR”) self-descriptive
- 5. Maybe • Monads are functional programming paradigms • “Maybe” implies presence/absence of a value • Typically we use `null` to indicate this • Monadic application can make null checks implicit • In F#, this is done with workflows • Redefinition of certain operators within a scope • How to do it in C#?
- 6. Dynamic Prototyping • Typical development cycle • Build • Run • Realize you need more functionality • Stop program • Rebuild, run again • Dynamic prototyping • Build • Run • Realize you need more functionality • Edit the program without stopping it • Program fixed at execution time! • Sources are up to date when you exit
- 7. That’s all folks! • Watch my TechDays videos! • Questions? • dmitrinesteruk@gmail.com • @dnesteruk