A process for rounding numbers.  This incarnation can be run like
  round 1.23 3.4 4
or by reading lines from stdin.  It could be simplified as an example by
getting rid of the argument-processing form.  It shows off templated
function composition using std.functional.pipe, ct-regexes, and component
programming.
I wrote this after realizing that there wasn't a convenient UNIX utility
for doing this and use it regularly.

---------------------------------
import std.algorithm,
    std.conv,
    std.functional,
    std.math,
    std.regex,
    std.stdio;

// Transforms input into a real number, rounds it, then to a string alias round = pipe!(to!real, lround, to!string);

// Matches numbers that look like they need rounding
static reFloatingPoint = ctRegex!`[0-9]+\.[0-9]+`;

void main(string[] args)
{
    // If arguments, process those and exit, otherwise wait around
    //  for input on stdin
    if (args.length > 1)
        args[1..$].map!round.joiner(" ").writeln;

    else
        // Replace anything that looks like a real number with the
        //  rounded equivalent.
        stdin.byLine(KeepTerminator.yes)
             .map!(l => l.replaceAll!(c => c.hit.round)(reFloatingPoint))
             .copy(stdout.lockingTextWriter());
}
---------------------------------

On Friday, 1 May 2015 at 17:17:09 UTC, Justin Whear wrote:
> A process for rounding numbers.

Thanks Justin. Could someone take this? We don't have PHP code for rotating examples randomly yet. -- Andrei

On Saturday, 2 May 2015 at 22:23:01 UTC, Andrei Alexandrescu wrote:
> On Friday, 1 May 2015 at 17:17:09 UTC, Justin Whear wrote:
>> A process for rounding numbers.
>
> Thanks Justin. Could someone take this? We don't have PHP code for rotating examples randomly yet. -- Andrei

Doesn't need to be PHP, just show one example statically and switch it with a random one with JS.

On Sunday, 3 May 2015 at 02:48:32 UTC, Vladimir Panteleev wrote:
> Doesn't need to be PHP

could also be D

On 5/2/15 7:48 PM, Vladimir Panteleev wrote:
> On Saturday, 2 May 2015 at 22:23:01 UTC, Andrei Alexandrescu wrote:
>> On Friday, 1 May 2015 at 17:17:09 UTC, Justin Whear wrote:
>>> A process for rounding numbers.
>>
>> Thanks Justin. Could someone take this? We don't have PHP code for
>> rotating examples randomly yet. -- Andrei
>
> Doesn't need to be PHP, just show one example statically and switch it
> with a random one with JS.

That'd work. I gather you just volunteered :o). -- Andrei

On 5/2/15 7:51 PM, Adam D. Ruppe wrote:
> On Sunday, 3 May 2015 at 02:48:32 UTC, Vladimir Panteleev wrote:
>> Doesn't need to be PHP
>
> could also be D

"code or it didn't happen" -- Andrei

Arrrg, formatting got torn up.  Here's a Dpaste: http://dpaste.dzfl.pl/ca190950f199

On Sunday, 3 May 2015 at 04:14:40 UTC, Andrei Alexandrescu wrote:
> On 5/2/15 7:48 PM, Vladimir Panteleev wrote:
>> On Saturday, 2 May 2015 at 22:23:01 UTC, Andrei Alexandrescu wrote:
>>> On Friday, 1 May 2015 at 17:17:09 UTC, Justin Whear wrote:
>>>> A process for rounding numbers.
>>>
>>> Thanks Justin. Could someone take this? We don't have PHP code for
>>> rotating examples randomly yet. -- Andrei
>>
>> Doesn't need to be PHP, just show one example statically and switch it
>> with a random one with JS.
>
> That'd work. I gather you just volunteered :o). -- Andrei

https://github.com/D-Programming-Language/dlang.org/pull/988