pi program

[John Colvin via Digitalmars-d-learn]

On Friday, 25 September 2015 at 12:51:17 UTC, Russel Winder wrote:
> On Fri, 2015-09-25 at 09:14 +0000, mzfhhhh via 
> Digitalmars-d-learn wrote:
>> [...]
>
> Aha, bingo, spot on. Thanks. Amended now to:
>
>     double reduce_string_loop() {
>       return reduce!"a + 1.0 / (b * b)"(iota(1, 100));
>     }
>
>     double reduce_function_loop() {
>       return reduce!((t, n) => t + 1.0 / (n * n))(iota(1, 100));
>     }
>
> which both work as they should. I am sure I will be able to 
> find a reason why I missed that reduce takes a function of two 
> parameters not one.
>
> Interesting question on style is whether to use function 
> application or method call:
>
> 	reduce!"a + 1.0 / (b * b)"(iota(1, 100))
>
> vs.
>
> 	iota(1, 100).reduce!"a + 1.0 / (b * b)"
>
> The debate may well turn into a bikeshed one, but it would be 
> good to know what the opinions are.

I vastly prefer the UFCS version, but unfortunately reduce has 
its arguments the wrong way around for that if you use the 
version that takes a seed...