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A comment on Show HN: NSString + Ruby.

Re:Show HN: NSString + Ruby by hamxiaoz on Thursday October 10, 2013 @05:38PM (#6530202)
Is 'category' like a extension method in c#?
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Re:Show HN: NSString + Ruby by fleitz on Thursday October 10, 2013 @06:34PM (#6530452)
Yeah, except you can add properties, though you have to do it with objc_(s|g)etAssociatedObject

https://developer.apple.com/library/ios/documentation/Cocoa/...

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