Method map

packages/shell/src/model/node-children.ts:145–149

* 类似数组的 map * @param fn

(fn: (node: IPublicModelNode, index: number) => T)

   * @param fn
   */
  map<T = any>(fn: (node: IPublicModelNode, index: number) => T): T[] | null {
    return this[nodeChildrenSymbol].map<T>((item: InnerNode, index: number): T => {
      return fn(ShellNode.create(item)!, index);
    });
  }

  /**
   * 类似数组的 every