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I know I can create an NSArray with @[@"foo", @"bar"] or an NSDictionary with @{@0 : @"foo", @1 : @"bar"}.
Is there a literal syntax for creating an NSMutableArray or an NSMutableDictionary?
No. Just as how there isn’t a syntax for creating an
NSMutableStringeither. Mutable objects are not particularly suited to literal values.