rotate

Cyclically shift a list's elements left or right.

.rotate(n) moves each element n places, wrapping around the ends — a cyclic shift. Positive n rotates left (toward the front), negative n rotates right.

Rotate left and right #

say <a b c d>.rotate(1);
say <a b c d>.rotate(-1);

(b c d a)
(d a b c)

rotate(1) moves the first element to the back; rotate(-1) moves the last to the front.

Notes #

• Nothing is lost — rotate is a permutation, so the result always has the same elements, just cyclically shifted.
• The count wraps: rotate(n) on a list of length L is the same as rotate(n % L).
• Related reshapers: rotor (chunks/windows) and reverse (flip); rotate alone shifts without reordering within the cycle.