/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#import <Foundation/Foundation.h>

/**
 Conveniences for working with collections.
 */
@interface FBCollectionOperations : NSObject

/**
 Creates and returns an Array of Numbers from an index set.
 Index Sets can be used for storing a collection of Integers, as can Arrays of Numbers.

 @param indeces the indeces to extract numbers from.
 @return an Array of Numbers of the indeces in the index set.
 */
+ (NSArray<NSNumber *> *)arrayFromIndeces:(NSIndexSet *)indeces;

/**
 Creates and returns an Index Set from an Array of Numbers
 Index Sets can be used for storing a collection of Integers, as can Arrays of Numbers.

 @param array an array of numbers to extract values from
 @return an Index Set of the values in the array.
 */
+ (NSIndexSet *)indecesFromArray:(NSArray<NSNumber *> *)array;

@end