Method insert

packages/core/src/lib/list-unit.ts:159–168

* Inserts items to the list-value. \ * Dispatches a new copy of the value, without mutating the current-value. * * It only works if the Unit is not frozen and there's at least 1 item to be inserted. * * @param start The zero-based index in the list from which to start adding i

(start: number, ...items: Item[])

   * @category Custom ListUnit
   */
  insert(start: number, ...items: Item[]): number {
    if (this.isFrozen || !items.length) {
      return this.length;
    }
    this.checkSerializabilityMaybe(items);

    this.splice(start, 0, ...items); // splice also takes care of empty spaces

    return this.length;
  }

  /**
   * Removes items at given indices from the list-{@link value}. \