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F# workshop

Prerequisites

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let hello = printf "Hello World"
hello

F# (pronounced “F Sharp”) is

Open Source
Multi platform
Modern, rising popularity
Lazy evaluated
Reusable
Concise (See signal-to-noise ratio)
Strongly typed
Functional first
- Use functional to write easy to test and understand code
- Use imperative for performance and compatibility
- Use objective for organization and encapsulation
Compiled

Not suitable for real time (unpredictable performance)
Hard to optimize (Functional languages fundamentally don't model how your computer works)
Functional first (different thinking process, you will need to re-learn)

programming language for writing simple code to solve complex problems.

let hello x = printfn "Hello %s" x
hello "world"

Introducing pipeline operator:

let hello x = printfn "Hello %s" x
"World" |> hello

pipeline operator definition

How to define the operator?

let inline (|>) x f = f x

let square x = x * x
let subtract x y = x - y

let ``complicated stuff`` x =
    printfn "%d" (add 5 (square x))

let ``another complicated stuff`` x =
    x |> square |> subtract 5 |> printfn "%d"

let equation x =
	x 
	|> (fun y -> y * y ) 
	|> (fun y z -> y - z ) 5
	|> printfn "%d"

Note that F# uses indentation to indicate block structure. Find out more here.

¹⁾

Read, Evaluate, Print Loop