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Counting words example in F# draft chapter
f#

Hello,

I'm trying to use the word counting example from Ch02-EssentialFSharp.doc:

#light

/// Analyze a string for duplicate words

let wordCount text =

let words = String.split [' '] text

let wordSet = Set.of_list words

let nWords = words.Length

let nDups = words.Length - wordSet.Count

(nWords,nDups)

let (nWords,nDups) = wordCount "All the king’s horses and all the king's

men"

I write the above code in a sample .fs file then I choose and ALT+ENTER

it, F# interactive window does not print the numbers but just types:

> >

val nWords : int

val nDups : int

However if I got F# interactive window and type:

> wordCount "All the king’s horses and all the king's men" ;;

val it : int * int = (9, 1)

On the other hand, if in F# interactive I type I get:

> let (nWords,nDups) = wordCount "All the king’s horses and all the

king's men" ;;

let (nWords,nDups) = wordCount "All the king’s horses and all the

king's men" ;;

-----------------------------------------------------------------------------------------^^^

stdin(14,79): error: syntax error.

However according to documentation I would be able to get:

> let (nwords, nDups) = wordCound "All the king's horses and all the

king's men";,

val nWords : int = 9

val nDups : int = 2

I'm a little bit confused. Any tips or explanations?

Regards,

--

Emre Sevinc

Istanbul Bilgi University

.

When using #light and typing entries directly into F# Interactive you must place the ";;" on a separate line. This is a known bug. The known issues with #light in the current implementation are documented on the F# website..

When using #light with visual studio you don't need the ";;" at all.

Apologies for this inconsistency.

Don

By on 9/26/2006 3:18 AM ()

I have added the following clarification to the head of the book chapter.

<i>[ Editors Note: there are a couple of minor issues that readers have spotted with the draft chapter<i> <UL><li><i>When using the F# Interactive console window with F# 1.1.12 you MUST currently place ";;" on a SEPARATE line, and not at the end of the line as shown in the book. When using it with Visual Studio you don't need the ";;" at all, as you can just highlight the text to execute and hit ALT-RETURN.<i> </li><li><i>F# Interactive does not print all values in exactly the same way as shown in the book . For example, variables bound by a "let" binding only have their types printed, and not their values. You have to type in the name of a value as an expression to actually see its value printed. <i><i>]<i></LI></UL>

By on 9/26/2006 6:31 AM ()

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