FreckleSimple Monadic Functional Reactive Programming for F#

What is Functional Reactive Programming?● Coined by Elliott Conal

○ Values over time (Behaviors)

○ Resolution- Independence

○ Extended: Push-Pull FRP (2009)

● 2012: Elm (javascript)○ Inventor: Evan Czaplicki

○ Signals (Event Streams)

○ Simplifies Javascript

○ Not “real” FRP according to Conal

○ Hidden state approach (foldp)

FRP is● Declarative● Time manipulation● Resolution Independence● Events as messages

FRP is not● Behaviors● Inherently time leaking● Hidden state

My View on FRP

FRP Dream

Freckle version

Mouse Position

Freckle Core Types

"Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away"

- Antoine de Saint-Exupery

Search with suggestions

FRP: Debouncing

The Game Loop

Sampling - Understanding the basics

What we want What we get

Sampling - The naïve solution

Freckle Sampling

Thank you for listening! ^.^