Re: How to cast an imperative loop into a readable recursive function ?

[Katalin Sinkov]

On Dec 2, 6:17 pm, Paul Rubin <no.em...@nospam.invalid> wrote:
> Katalin Sinkov <lispstyl...@gmail.com> writes:
> > How to cast an imperative loop into a readable recursive function ?
> > What questions to ask to guide thinking to it ?
>
> The functional-programming answer is that you rarely need explicit
> recursion.  You can instead usually use higher-order functions like map
> and reduce, that are defined in terms of recursion.
>
> Maybe you want to read SICP, if you haven't done so already?
>
> > Here is the concrete problem.
> > which is to find the nth character T_n in a string with erratic index
> > reset and length of substring given. ie
>
> I'm sorry, I couldn't understand the problem description.

another smaller example

s=index
v=value

series is

s=2345789
v=abcdwxy

after 5 there is 7 because there was a reset in the form
(s=7,l=whatever)

(s=2,l=4)2345(s=7,l=whatever)

only start index of the subseries is mentioned inside parens.

hope it was clear, or i can try again