It seems to me that the author should be using Julia. There's not much comparison with encapsulation because Julia isn't exactly object-oriented in the sense t

It seems to me that the author should be using Julia. There's not much comparison with encapsulation because Julia isn't exactly object-oriented in the sense that objects have methods, instead methods have types that are deployed with multiple-dispatch. Julia provides first-class support for anonymous functions: function (x) x^2 + 2x - 1 end Julia also provides full macros for metaprogramming. And you also get a type-annotation system and type inference. Newer releases also add support for return types.