Zero-Width Characters: Invisibly fingerprinting text 9 years ago
Also useful for pretending chat-bots are broken.
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jmillikan
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Frege: A Haskell-Like Language for the JVM 11 years ago
Calling Java from frege isn't hard, but there isn't currently a way to directly implement interfaces or inherit abstract classes in just frege. You can create a sort of proxy in Java (or whatever) and implement methods in frege, but it's not pretty. (I think; I haven't quite comprehended the examples.)
The article at https://mmhelloworld.github.io/blog/2013/07/10/frege-hello-j... talks about this, but doesn't quite explain the proxy mechanism, it just points out an example.