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banana_dictionary.m
Objective-C
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@interface Banana : NSObject
- (id)objectForKeyedSubscript:(id)key;
- (void)setObject:(id)obj forKeyedSubscript:(id <NSCopying>)key;
@end
 
@implementation Banana
NSMutableDictionary *_attributes;
 
-(id) init {
self = [self init];
if (self) {
_attributes = [[NSMutableDictionary alloc] init];
}
return self
}
 
- (id)objectForKeyedSubscript:(id)key {
return _attributes[key];
}
 
- (void)setObject:(id)obj forKeyedSubscript:(id <NSCopying>)key {
_attributes[key] = obj;
}
@end
 
Banana *banana = [[Banana alloc] init];
banana[@"colour"] = @"Yellow";
banana[@"colour"]; // returns "Yellow"

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