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This is not pure way of doing meta programming. It looks at the code to figure out what methods are being called in future.

Opal.add_stubs(["first", "second", "to_sym"]);

But lets say I am dynamically generating method using a string passed from user input or server then this would fail.

I had the same fear at first, but actually if you generate dynamically a method name you need to use `#__send__` (and friends) to call it.