Codemash 2018 – Functional Programming With C# 7.1

Presenter Ed Charbaneou

• Style Comparison
  • Functional Programming
    • Focuses on mathematical progress
    • Stateless
    • Fixed expressions that are stateless and return a result
  • Imperative
    • void method
    • black box
    • maintains state
• A Functional Focus
  • Application doesn’t maintain state
  • Why now
    • Multithreading
    • Cloud computing
    • Stateless much better when multithreading
    • Maintaining state is hard, especially in multithreading
• Functional Features
  • 3
    • LINQ
    • => Expressions
    • Extension Methods
  • 6
    • Expression Bodied Memebers
  • 7.1
    • Tuples
    • Pattern Matching
    • ++Expressions Bodied Members
  • .net does not yet have immutable types
    • immutable type cannot be changed after its insantiation
  • Func Delegates
    • Allow us to pass around code as a variable
  • Higher Order Function
    • A Function that either takes a function as a parameter or returns a function as a parameter
• Method Chaining (Pipelines)
  • Don’t see pipes in .net since can method chain
• Extension Methods
  • Yep they exist.  They have existed for a decade, not sure why going over them here.
• Reviewed yield/return.  Another 10 year old structure.  Functional, I suppose.  I always thought purpose was to be able to act on iterated values without having to finish iteration.
• Reviewed LINQ methods available.  OK.
• Now onto programming excercise