Utilities

import { combine, once, reorder } from '@0001-labs/drag';

combine

Combines cleanup functions in their supplied order and runs them at most once.

const cleanup = combine(cleanupDraggable, cleanupTarget, cleanupMonitor);
cleanup();
cleanup(); // No-op.

once

Wraps a function so subsequent calls return its first result without calling it again.

const setup = once(() => expensiveSetup());
const first = setup();
const same = setup();

reorder

Returns a new array with the item at startIndex moved to finishIndex. It leaves the original array unchanged, including when both indexes are equal.

const next = reorder({ list: ['Read', 'Build', 'Ship'], startIndex: 0, finishIndex: 2 });
// ['Build', 'Ship', 'Read']

Both indexes must be integers within the list. Non-integer indexes throw TypeError; out-of-bounds indexes throw RangeError. Check a drag’s destination before calling this helper. It reorders one list; cross-list moves need an update to both collections.