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IGListArrayUtilsInternal.h
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IGListArrayUtilsInternal.h
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/**
* Copyright (c) 2016-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.
*/
#ifndef IGListArrayUtilsInternal_h
#define IGListArrayUtilsInternal_h
static NSArray *objectsWithDuplicateIdentifiersRemoved(NSArray<id<IGListDiffable>> *objects) {
if (objects == nil) {
return nil;
}
NSMutableSet *identifiers = [NSMutableSet new];
NSMutableArray *uniqueObjects = [NSMutableArray new];
for (id<IGListDiffable> object in objects) {
id diffIdentifier = [object diffIdentifier];
if (diffIdentifier != nil
&& ![identifiers containsObject:diffIdentifier]) {
[identifiers addObject:diffIdentifier];
[uniqueObjects addObject:object];
} else {
IGLKLog(@"WARNING: Object %@ already appeared in objects array", object);
}
}
return uniqueObjects;
}
#endif /* IGListArrayUtilsInternal_h */