Challenge Tuples

[Salih Dincer]

On Saturday, 27 April 2024 at 15:36:40 UTC, Nick Treleaven wrote:
> On Saturday, 27 April 2024 at 15:32:40 UTC, Nick Treleaven 
> wrote:
>> On Saturday, 27 April 2024 at 11:55:58 UTC, Basile B. wrote:
>>>         foreach const e in u do
>>>             if echo(is, e, T) do
>>>                 result += e;
>
>>         static if (is(typeof(e) == int))
>>             r += e;
>
> Actually I would write that:
> ```d
>     R r;
>     foreach (e; v)
>     {
>         static if (is(typeof(e) : R))
> ```

I like the new sum() function, great Nick!  Moreover, it also 
works with an ordinary range:

```d
   enum limit = 100; // sum = 5050
   iota(limit + 1).sum.writeln;
```

Python seems too complicated to me, but C# looks delicious. 
Moreover, it was implemented without defining IEnumerator. Well 
done Matheus!

SDB at 79