Impressed

[Jesse Phillips]

On Friday, 27 July 2012 at 13:10:46 UTC, Stuart wrote:
> On Friday, 27 July 2012 at 03:00:25 UTC, Brad Anderson wrote:
>>
>> D equivalent: iota(0, int.max, 2).map!(a => /* do something 
>> with even numbers */)();
>
> I think you're missing the point. The purpose isn't to generate 
> a sequence of numbers, but to illustrate how the Yield keyword 
> is used in VB.NET. Sure, getting a sequence of numbers may be 
> straightforward, but what about a lazy-populated list of all 
> files on a computer? That can be done using Yield - and more 
> importantly, WRITTEN like a normal synchronous function. Let's 
> see you do that with map.

You wouldn't use map for that, that would be silly.

Taking a look at DirIteratorImpl[1] in std.file suggest there is 
a lot of setup to navigate the filesystem on Windows. How does 
Yield help with that logic?

1. 
https://github.com/D-Programming-Language/phobos/blob/master/std/file.d#L2397

Seriously I'll take my composing ranges over iterators any day.