given an array is there a way to get a list/array/sequence/whatever of each value and its associated index? Similar to .items() in python or Object.fromEntries() (or even just map) in js?

Are you talking about array from the math library, or the actual “array” for Racket which is called vector?

from the math library

Maybe https://docs.racket-lang.org/math/array_sequences.html#%28def._%28%28lib._math%2Farray..rkt%29._in-array-indexes%29%29\|in-array-indexes ?

(used in a for-loop)

ah, yes, I think that could work

I actually think I tried searching that too, but searched in-array-indicies

I use indices too. According to https://www.nasdaq.com/articles/indexes-or-indices-whats-the-deal-2016-05-12 it’s even the “mathematical” spelling.

It would be nice if the elements in in-array and in-array-indexes match. They probably do.

There’s in-indexed which works with any sequence

not with array it would seem #+begin_src racket <<racket/my-imports>> (define board (list*->matrix '((water water water water) (water water land water) (land land land water) (water land water water) (land land water water)))) (~> board in-indexed sequence->list) #+end_src #+RESULTS: : in-indexed: contract violation : expected: sequence? : given: (array #[#['water 'water 'water 'water] #['water 'water 'land 'water] #['land 'land 'land 'water] #['water 'land 'water 'water] #['land 'land 'water 'water]]) : context...: : /tmp/ob-racket-wqzp30/ob-racketcNUWZZrkt:22:4 : body of "/tmp/ob-racket-wqzp30/ob-racketcNUWZZrkt"

it’s meant for 1d sequences