A few range questions

[Gary Willoughby via Digitalmars-d-learn]

On Tuesday, 5 January 2016 at 18:47:30 UTC, Charles Smith wrote:
> 1. `arr[].sort` is changing arr in place. Any way to not do 
> that?

Use this instead:

auto result = sort(arr[].dup);

.dup duplicates the array and sort(...) uses the std.algorithm 
sort and not the built-in array sort method.

> 2. I noticed that result within `countingSort` is an array of 
> arrays. I thought `chain` would concat them... did I miss 
> something obvious?

No idea yet.