Fix nullabiilty. You must return an object for every element.
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@ -38,9 +38,9 @@
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- (nonnull NSString *)stringAtIndex:(NSUInteger)index;
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// Maps this array to a new array of T objects given a conversion block. Objective-C implementation of Swift's map. https://developer.apple.com/documentation/swift/array/2908681-map
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- (nonnull NSArray *)map:(id _Nullable (^_Nonnull)(id _Nonnull obj))mapBlock;
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- (nonnull NSArray *)filter:(BOOL (^_Nullable)(id _Nonnull obj))block;
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- (nonnull NSArray *)map:(id _Nonnull (^_Nonnull)(id _Nonnull obj))mapBlock;
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- (nonnull NSArray *)filter:(BOOL (^_Nonnull)(id _Nonnull obj))block;
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- (nonnull id)reduce:(id _Nonnull)initial block:(id _Nonnull (^_Nonnull)(id _Nonnull obj1,id _Nonnull obj2))block;
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- (nullable NSArray *)flatMap:(id _Nullable (^_Nonnull)(id _Nullable obj))block;
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- (nonnull NSArray *)flatMap:(id _Nonnull (^_Nonnull)(id _Nullable obj))block;
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@end
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