Introduction to FSharp

Valdis Iljuconoks
Technical Fellow, Software Architect
Microsoft MVP

Geta AS, Viiar Consulting
valdis.iljuconoks@dotnet.lv
http://dotnet.lv/blogs/vi
@tech_fellow

functional
First official

programming language on .Net

do more with less
see where C# and VB.NET are headed
learn new language every year

functional
object-oriented
imperative

Theorem proving ISWIM (1966)

ML
CAML
OCAML
F#

// F# // C#
let a = 2 ≠ int a = 2

// F# // C#
let a = 2 static int a()
{
return 2;
}

let a = 2
let a = 3

error: FS0037 Duplicate definition of value ‘a’

Immutable by default

let sqr x = x * x

> val sqr parameter int
: int ->

sqr 5 signature
data type
> val it: int = 25

result

high order functions

A higher-order function is a function

that takesanother function as a parameter,
or a function that returns another function as a value,
or a function which does both.

let sqr x : float = x * x
let mply a b : float = a * b

let mplyPI a = mply a 3.14159

let cylinderVolume radius length =
mplyPI length * sqr radius

demo

function pipelining (|>)

demo

function composition (>>)

type NullableInt =
| Value of int
| Nothing of unit

match x with
| Value -> ...
| Nothing -> ...

Introduction to FSharp

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