setObjectforKey
setObject:forKey: is an instance method of NSMutableDictionary in the Foundation framework. It adds or updates a key-value pair in the dictionary, using the provided key to identify the entry and the provided object as the value. If the key already exists, the existing value is replaced with the new one.
Signature and constraints: - (void)setObject:(id)anObject forKey:(id<NSCopying>)aKey;. The key must conform to NSCopying, and neither anObject nor aKey
Usage examples: Objective-C code often uses setObject:forKey: with a mutable dictionary. For example, NSMutableDictionary *dict = [NSMutableDictionary
Context and alternatives: This method is specific to mutable dictionaries; NSDictionary, being immutable, does not support