Exquisite code samples

[Paulo Pinto]

On Monday, 9 July 2012 at 11:16:45 UTC, Gor Gyolchanyan wrote:
> I've put together a code sample, which could demonstrate the 
> awesome power
> of D when it comes to getting good results very quickly and 
> safely. Perhaps
> it could end up on display for newcomers:
>
> import std.traits;
>
> /// Returns the t-th point on the bezier curve, defined by 
> non-empty set p
> of d-dimensional points, where t : [0, 1] and d > 1.
> real[d] bezier(size_t d, Number)(Number[d][] p, Number t)
>     if(d > 1 && isFloatingPoint!Number)
> in
> {
>     assert(p.length > 0);
>     assert(t >= 0.0L && t <= 1.0L);
> }
> body
> {
>     return p.length > 1 ? (1 - t) * p[0..$-1].bezier(t) + t *
> p[1..$].bezier(t) : p[0];
> }
>
> /// Returns k unidistant points on the bezier curve, defined by 
> non-empty
> set p of d-dimensional points, where k > 0 and d > 1.
> real[d][] bezier(size_t d, Number)(Number[d][] p, size_t k)
>     if(d > 1 && isFloatingPoint!Number)
> in
> {
>     assert(p.length > 0);
>     assert(k > 0);
> }
> body
> {
>     Number[d][] result = new Number[d][k];
>     foreach(i; 0..k)
>         result[k] = p.bezier(i * (1.0L / k));
>     return result;
> }

I would not show this to newcomers, as they would probably go 
running for Go.

This type of code is quite nice and the reason why I think I am 
better served with D than Go, but newcomers without strong 
generic programming background in other languages might get 
scared.

--
Paulo