@wordpress/block-editor/build-module/store/array.js

Generic block editor.

/**
 * Insert one or multiple elements into a given position of an array.
 *
 * @param {Array}  array    Source array.
 * @param {*}      elements Elements to insert.
 * @param {number} index    Insert Position.
 *
 * @return {Array} Result.
 */
export function insertAt(array, elements, index) {
  return [...array.slice(0, index), ...(Array.isArray(elements) ? elements : [elements]), ...array.slice(index)];
}

/**
 * Moves an element in an array.
 *
 * @param {Array}  array Source array.
 * @param {number} from  Source index.
 * @param {number} to    Destination index.
 * @param {number} count Number of elements to move.
 *
 * @return {Array} Result.
 */
export function moveTo(array, from, to, count = 1) {
  const withoutMovedElements = [...array];
  withoutMovedElements.splice(from, count);
  return insertAt(withoutMovedElements, array.slice(from, from + count), to);
}
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