Version 2.24 of package Seq has just been released in GNU ELPA. You can now find it in M-x list-packages RET.
Seq describes itself as: =============================== Sequence manipulation functions =============================== More at https://elpa.gnu.org/packages/seq.html ## Summary: Sequence-manipulation functions that complement basic functions provided by subr.el. All functions are prefixed with "seq-". All provided functions work on lists, strings and vectors. Functions taking a predicate or iterating over a sequence using a function as argument take the function as their first argument and the sequence as their second argument. All other functions take the sequence as their first argument. ## Recent NEWS: [Not available 🙁]
