Draft Chapter 2 of "Expert F#": Essential Language Features

re: Draft Chapter 2 of "Expert F#": Essential Language Features

Eralp — Mon, 04 Aug 2008 10:34:46 GMT

Thanks For book , It's amazing..I 'll share all of my information about F# with all Turkish programmers at university!.

re: Draft Chapter 2 of "Expert F#": Essential Language Features

dhoward — Wed, 06 Dec 2006 19:14:12 GMT

thanks that helps. I suggest you add something like that to the chapter because the original statement is confusing to an imperative language programmer, such as myself, who think in terms of variables as memory locations that contain a value that can change.

re: Draft Chapter 2 of "Expert F#": Essential Language Features

dsyme — Wed, 06 Dec 2006 03:46:17 GMT

In reply to the above -

"rebinding" a name to a new value is different to "changing the value itself" - e.g. even in F# Interactive after

let x = 1

let y() = x

let x = 2

then "y()" will still have the value "1". If you want to really mutate values use

let mutable x = 1

let y() = x

do x <- 2

F# helps show we're not Neanderthals

Don Syme's WebLog on F# and Other Research Projects — Wed, 06 Dec 2006 02:21:06 GMT

Well, sort of :-) One of our most recent scientific users of F# is Darren Platt , head of computational

re: Draft Chapter 2 of "Expert F#": Essential Language Features

dhoward — Fri, 01 Dec 2006 23:00:22 GMT

regarding a statement in the draft chapter, there is something I don't understand. it says

"in other languages a local “value” is called a local variable. However in F# you can’t change the immediate value of locals after they’ve been initialized, unless the local is explicitly marked as mutable. "

however, in fsi the following rebinding of a local works without complaint, whereas the global rebind fails with the expected error message. what am I missing?

> let test x =

- let a = 1

- let a = 2

- printf "%d %d\n" a x

- ;;

val test : int -> unit

> test 1

- ;;

2 1

val it : unit = ()

> let a = 1

- let a = 2

- ;;

let a = 2

----^^

stdin(142,4): error: FS0037: Duplicate definition of value 'a'

stopped due to error

re: Draft Chapter 2 of "Expert F#": Essential Language Features

Song — Sun, 26 Nov 2006 15:08:24 GMT

very intersting,i'll focus

Interesting Finds: September 6, 2006

Jason Haley — Thu, 07 Sep 2006 05:34:08 GMT

Draft Chapter 2 of "Expert F#": Essential Language Features

Heart of Sharpness (The MSR F# Team's blog at The Hub) — Thu, 07 Sep 2006 02:53:02 GMT

( Syndicated&nbsp;from http://blogs.msdn.com/dsyme/archive/2006/09/06/DraftChapter2.aspx&nbsp;)
I'm...

Draft Chapter 2 of "Expert F#": Essential Language Features

re: Draft Chapter 2 of "Expert F#": Essential Language Features

re: Draft Chapter 2 of "Expert F#": Essential Language Features

re: Draft Chapter 2 of "Expert F#": Essential Language Features

F# helps show we're not Neanderthals

re: Draft Chapter 2 of "Expert F#": Essential Language Features

re: Draft Chapter 2 of "Expert F#": Essential Language Features

Interesting Finds: September 6, 2006

Draft Chapter 2 of &quot;Expert F#&quot;: Essential Language Features

Draft Chapter 2 of "Expert F#": Essential Language Features