Book recommendation

[alex]

Thanks for the link John!


On Monday, 14 October 2013 at 21:09:32 UTC, Adam Wilson wrote:
>
> That is actually incorrect. Tango was a replacement for the 
> Phobos Standard Library in D1 to expand on the thin 
> capabilities of the library at the time. In D2 (current D 
> implementation) Phobos is now the default standard library and 
> includes most of the functionality of Tango. Ergo, TDPL 
> (Andrei's Book) is the current Gold Standard D book.

So Tango replaced Phobos, just to be replaced by Phobos later?

What are/were the fundamental differences? Why two libraries? 
This admittedly kind of confused me :-D