text: //
  //  NSIndexSet+ASHelpers.h
  //  AsyncDisplayKit
  //
  //  Created by Adlai Holler on 6/23/16.
  //  Copyright © 2016 Facebook. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  @interface NSIndexSet (ASHelpers)
  
  - (NSIndexSet *)as_indexesByMapping:(NSUInteger (^)(NSUInteger idx))block;
  
  - (NSIndexSet *)as_intersectionWithIndexes:(NSIndexSet *)indexes;
  
  /// Returns all the item indexes from the given index paths that are in the given section.
  + (NSIndexSet *)as_indexSetFromIndexPaths:(NSArray<NSIndexPath *> *)indexPaths inSection:(NSUInteger)section;
  
  /// If you've got an old index, and you insert items using this index set, this returns the change to get to the new index.
  - (NSUInteger)as_indexChangeByInsertingItemsBelowIndex:(NSUInteger)index;
  
  - (NSString *)as_smallDescription;
  
  /// Returns all the section indexes contained in the index paths array.
  + (NSIndexSet *)as_sectionsFromIndexPaths:(NSArray<NSIndexPath *> *)indexPaths;
  
  - (NSArray<NSIndexPath *> *)as_filterIndexPathsBySection:(id<NSFastEnumeration>)indexPaths;
  
  @end
  