- vector-fold kons knil vec_1 vec_2 ···procedure
The fundamental vector iterator. Kons is iterated over each index in all of the vectors, stopping at the end of the shortest; kons is applied as (kons i state (vector-ref vec_1 i) (vector-ref vec_2 i) ···) where state is the current state value — the current state value begins with knil, and becomes whatever kons returned at the respective iteration —, and i is the current index.
The iteration is strictly left-to-right.
Find the longest string's length in vector-of-strings.
(vector-fold (λ (index len str) (max (string-length str) len)) 0 vector-of-strings)
Produce a list of the reversed elements of vec.
(vector-fold (λ (index tail elt) (cons elt tail)) '() vec)
Count the number of even numbers in vec.
(vector-fold (λ (index counter n) (if (even? n) (+ counter 1) counter)) 0 vec)