on slices, negative indices, which are the equivalent procedures?

[Greg Ewing]

On 6/08/21 12:00 pm, Jack Brandom wrote:
> It seems
> that I'd begin at position 3 (that's "k" which I save somewhere), then I
> subtract 1 from 3, getting 2 (that's "c", which I save somewhere), then
> I subtract 1 from 2, getting 1 (that's "a", ...), then I subtract 1 from
> 1, getting 0 (that's J, ...), so I got "kcaJ" but my counter is 0 not
> -13, which was my stopping point.

You need to first replace any negative or missing indices with
equivalent indices measured from the start of the string.

When you do that in this example, you end up iterating backwards from 3
and stopping at -1.

-- 
Greg