Suggestion for the author. Reformat the code of your translated example. I truly found it impenetrable until I formatted it more like idiomatic d3.js code. With this reformatting, I'll buy that it is less annoying and tedious than the original.

    console.log(
      Maybe(person)
        .bind(function(p) { return p["address"]; })
        .bind(function(a) { return a["state"]; })
        .maybe("State unknown", function(s) { return s; })
    );

And then I realized that d3.js code is monads! (shout it like Charlton Heston in Soylent Green)