"chain" vs "~"

[pascal111]

On Sunday, 7 August 2022 at 03:55:50 UTC, Emanuele Torre wrote:
> On Sunday, 7 August 2022 at 01:22:18 UTC, pascal111 wrote:
>> [...]
>
> They are quite different:
> * `chain` gives you "range" (iterator) that starts from the 
> first element of `x` and ends at the last element of `y` (like 
> e.g. `zip` in other languages).
> * `~` creates a new `int[]` with elements from `x` and the 
> elements from `y`.
>
> [...]

I was wondering why they in D repeating ways for the same 
function, but I know now I'm wrong, "chain" isn't like "~".