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Course 4 - Summary

1. Application with F#.net:
   Interpretation vs. Compilation

dotnet fsi
>

2. Everything is a function:

(fun x->x+1) 0;;
(fun x->fun y->x+y) 0 1;;
(fun x y->x+y) 0 1;;
(fun o->fun x->fun y->o x y) (+) 0 1;;
...

Nb. Binary function symbols can be written in "infix" notation (and overloaded).

3. Only 7 keywords: fun, let_rec, match_with, type_of

// (fun pi->...) 3.14
let pi     = 3.14;;

let area   = fun r->pi*r*r;;
let area r = pi*r*r;;
area 1;;

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