A little of coordination for Rosettacode

[bearophile]

> This D entry uses Tango, but it should also show a version for 
> Phobos:
>
> http://rosettacode.org/wiki/Rosetta_Code/Count_examples#D

Two versions


The Mathematica solution is short:

TaskList = Flatten[
    
Import["http://rosettacode.org/wiki/Category:Programming_Tasks", 
"Data"][[1, 1]]];
Print["Task \"", StringReplace[#, "_" -> " "], "\" has ",
   Length at Select[Import["http://rosettacode.org/wiki/" <> #, 
"Data"][[1,2]],
   StringFreeQ[#, __ ~~ "Programming Task" | __ ~~ "Omit"]& ], " 
example(s)"]&
   ~Map~ StringReplace[TaskList, " " -> "_"]


This Perl solution is compact:

use v5.10;
use Mojo::UserAgent;

my $site = "http://rosettacode.org";
my $list_url = 
"/mw/api.php?action=query&list=categorymembers&cmtitle=Category:Programming_Tasks&cmlimit=500&format=xml";

my $ua = Mojo::UserAgent->new;
$ua->get("$site$list_url")->res->dom->find('cm')->each(sub {
     (my $slug = $_->{title}) =~ tr/ /_/;
     my $count = 
$ua->get("$site/wiki/$slug")->res->dom->find("#toc 
.toclevel-1")->size;
     say "$_->{title}: $count examples";
});



The F# solution performs downloads concurrently and it's said to 
be fast:

#r "System.Xml.Linq.dll"

let uri1 = 
"http://www.rosettacode.org/w/api.php?action=query&list=categorymembers&cmtitle=Category:Programming_Tasks&cmlimit=500&format=xml"
let uri2 task = sprintf 
"http://www.rosettacode.org/w/index.php?title=%s&action=raw" task

[|for xml in (System.Xml.Linq.XDocument.Load 
uri1).Root.Descendants() do
     for attrib in xml.Attributes() do
       if attrib.Name.LocalName = "title" then
         yield async {
           let uri = uri2 (attrib.Value.Replace(" ", "_") |> 
System.Web.HttpUtility.UrlEncode)
           use client = new System.Net.WebClient()
           let! html = client.AsyncDownloadString(System.Uri uri)
           let sols' = html.Split([|"{{header|"|], 
System.StringSplitOptions.None).Length - 1
           lock stdout (fun () -> printfn "%s: %d examples" 
attrib.Value sols')
           return sols' }|]
|> Async.Parallel
|> Async.RunSynchronously
|> fun xs -> printfn "Total: %d examples" (Seq.sum xs)


Bye,
bearophile