Learning two dialects simultaneously (CL/Scheme)

Hi, I am just getting started with Lisp but am an experienced
programmer since earlier, with some cursory experience with
functional programming, and adept at picking up programming

I was wondering if it is ill-advised to learn two dialects
simultaneously, specifically Common Lisp and Scheme. I have some
books that relate to AI and interpreters where some use Scheme
and other CL and would like to be able to get work with books
from these two domains simultaneously.

So, bad idea or not?

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In my experience they are

In my experience they are different enough that spillover is not a danger. That is, if you know in advance that they are not the same language - something no one told me early on...

mostly a good idea because contrast can lend clarity

Probably a good idea, since you'll learn more, and contrast may improve grasp of each, if you are up for a bigger learning experience. It would help to have a good memory and an analytical bent, to distinguish similar things. A feature in one might seem more clear to you after you imagine how to achieve it in the other too. (Languages just make certain things easier; rarely are things denied unless a language forbids them on principle.)

If you work closely with someone, they might find your greater view irritating any time you refer to a language not used in collaboration. Pragmatically, most view this as a waste of time. And a significant minority, perhaps even a majority of devs, have a competitive point of view casting unknown areas of expertise as attacks on their competence, though perhaps only as a social game move (they won't mind you knowing more unless you show it before a witness). You might ask others, since that kind of game is alien to me. Still, aim to get along with people.

There's probably an interesting sub-topic in comparing the two languages, which is the sort of meta discussion that works well as a PL thread.

Rewarding responses

Thank you both. I am definitely up for the bigger learning experience and plan to essentially write about the experience to analyse the overlap and distinctness of both dialects.

I am learning Lisp on my own so there is no risk there.

I will be sure to return to the forum with my meta discussion as it progresses.

Kind regards,

Only tangentially related,

Only tangentially related, but this from Norvig, might be helpful and shows how you can profit from such comparisons.