A Brief Introduction to F#

re: A Brief Introduction to F#

John Donnelly — Thu, 02 Dec 2010 15:42:31 GMT

Nice post Mark. I needed that overview. Examples are the key to getting these things through my thick skull.

Thanks!

re: A Brief Introduction to F#

Mark Bloodworth — Thu, 02 Dec 2010 12:05:43 GMT

Mike, you're quite right. The x can be omitted.

iouri - I wanted to include the concept of immutability and maybe the example is too simple.. As I understand it, identifiers in functions can be redefined (as in your example) although I think this may be at the cost of reability. I also think that for newcomer to F#, there is a benefit in adopting a functional style (as aopposed to continuing to use an imperative style.)

re: A Brief Introduction to F#

Mike Hadlow — Thu, 02 Dec 2010 10:07:30 GMT

Mark, in your currying example, there's no need to supply the 'x':

> let m a b = a * b;;

val m : int -> int -> int

> let square = m 2;;

val square : (int -> int)

> square 3;;

val it : int = 6

re: A Brief Introduction to F#

iouri — Thu, 02 Dec 2010 09:21:45 GMT

Hi,

The immutability example is a bit misleading. The code will compile unless used in a module to declare two bindings with the same name.

Following function:

let f () =

let x = 1

let x = x + 1

is perfectly valid, compiles and returns 2 as its result.

iouris at gmail dot com

re: A Brief Introduction to F#

mr — Thu, 02 Dec 2010 09:09:38 GMT

let double x = multiply 2 x

really an example for "currying"? Shouldn't it be

let double = multiply 2