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rotate ​

Problem ​

You need to shift items in a circular buffer — moving the first item to the end, or rotating a carousel.

Solution ​

Use rotate(array, positions, options?) to rotate left (positive) or right (negative).

ts
import { rotate } from '@vielzeug/arsenal';

rotate([1, 2, 3, 4, 5], 2); // [3, 4, 5, 1, 2]
rotate([1, 2, 3, 4, 5], -1); // [5, 1, 2, 3, 4]

Pitfalls ​

  • positions is taken modulo the array length, so rotating by n * length is a no-op.