Idiomatic adjacent_difference

[anonymous via Digitalmars-d-learn]

On Friday, October 16, 2015 02:03 PM, Per Nordlöw wrote:

> zip(r, r.dropOne).map!((t) => t[1]-t[0]);

You should r.save one or both of those. The dropOne may affect both 
instances if you don't .save.

By the way, what's the point of `dropOne` over `drop(1)`? It's not shorter. 
Does it do anything subtly different?