Determine if a hash has any of a set of values defined using sweet ES6 functional programming methods #map and #reduce

hash_has_values.js

function hasValues(hash, fields) {
  return fields.map(field => {
    return hash[field] != null;
  }).reduce((x, y) => { return x || y });
}

hash = { name: "robert paulson", affiliation: "fightclub" };
hasValues(hash, [ "name", "email" ]); // => true
hasValues(hash, [ "email" ]); // => false