F# Eye for the C# Guy

F# Eye for the C# guy Leon Bambrick, secretGeek.net

Purely functional… ,[object Object],[object Object],[object Object]

Purely functional… ,[object Object],[object Object]

[object Object],Purely functional…

[object Object],[object Object],Why learn F#?

[object Object],[object Object],[object Object],Why learn F#?

[object Object],[object Object],[object Object],[object Object],Why learn F#?

[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Computer Economics is Changing

This tips the balance toward higher abstractions

Some Applications of F# ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Game Programming Involves… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Genealogy of F # … ,[object Object]

Genealogy of F # … ,[object Object],[object Object]

Genealogy of F # … ,[object Object],[object Object],[object Object]

Genealogy of F # … ,[object Object],[object Object],[object Object],[object Object],Oh!

Genealogy of F # … ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Oh!

WTF # ? ,[object Object],[object Object]

WTF # ? ,[object Object],[object Object],[object Object]

WTF # ? ,[object Object],[object Object],[object Object],[object Object]

Code! ,[object Object],[object Object]

Code! ,[object Object],[object Object],The ‘let’ keyword represents a binding between a value and an expression tree.

Code! ,[object Object],[object Object],The ‘let’ blah blah blahblah blah blahblah blahblah blah blah blah blah blah blah.

Code! ,[object Object],[object Object],//C# int a = 2 ≠

Code! ,[object Object],[object Object],//C# //a function! static int a() { return 2; } More like

More Code! ,[object Object],[object Object],[object Object],[object Object],[object Object],//C# using System; namespace ConsoleApplication1 { class Program { static int a() { return 2; } static void Main( string [] args) { Console .WriteLine(a); } } }

More Code! ,[object Object],[object Object],[object Object],[object Object],[object Object],More Noise Than Signal!

More Code! ,[object Object],[object Object],[object Object],[object Object],[object Object],Looks Weakly typed? Maybe Dynamic?

More Code! ,[object Object],[object Object],[object Object],[object Object],[object Object],Type Inference

[object Object],[object Object],[object Object],Immutable by default

[object Object],[object Object],[object Object],[object Object],simple function…

[object Object],[object Object],[object Object],[object Object],simple function… Parameter

[object Object],[object Object],[object Object],[object Object],simple function… “ Signature”

[object Object],[object Object],[object Object],[object Object],simple function… Types are “inferred”

Discriminated union types ,[object Object],[object Object],[object Object]

Discriminated union types ,[object Object],[object Object],[object Object],Wish C#/“O-O” had this.

Discriminated union types ,[object Object],[object Object],[object Object],“ O-O” has discriminated union envy When the only tool you have is a hammer Everything looks like a nail

Discriminated union types ,[object Object],[object Object],[object Object],“ O-O” has discriminated union envy When the only tool you have is a hammer Everything looks like a nail e.g. “Inheritance” ends up being used in places where it’s not a perfect fit…

Discriminated union types ,[object Object],[object Object],[object Object],“ O-O” has discriminated union envy When the only tool you have is a hammer Everything looks like a nail e.g. “Inheritance” ends up being used in places where it’s not a perfect fit… ‘ Discriminated union types’ -- a better fit for some problems?

Another great tool is “pattern matching”

Another great tool is “pattern matching” “ Switch/Case” statements on steroids

Another great tool is “pattern matching” “ Switch/Case” statements on steroids “ method overloads” on crack

Discriminated unions example ,[object Object],[object Object],[object Object],[object Object]

Pattern Matching ,[object Object],[object Object],[object Object],[object Object],//block any weapon! let block w = match w with | Knife | Gun -> disarm w | _ -> difuse w block Gun block Knife block Bomb

Pattern Matching ,[object Object],[object Object],[object Object],[object Object],//block any weapon let block w = match w with | Knife | Gun -> disarm w | _ -> difuse w block Gun block Knife block Bomb

Lazy is a virtue ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Useful libraries Neat manual Awesome Samples

“ Empty” source file… 5 pages of help!

Make sure F# Interactive is running!

F# Interactive: ,[object Object]

8 Ways to Learn ,[object Object],[object Object],[object Object],[object Object]

Acknowledgements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

F# Eye for the C# Guy

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Editor's Notes