In this exercise, I transform given data into a list of objects that have 'first' and 'last' labels as keys.

transformData.js

var data = {
    first: ["Alvaro", "Lewis", "Craig"],
    last: ["Carrasco", "Moronta", "Pottinger"]
  }, result = [];

var combineNames = function() {
  return _.zip(_.values(data)[0], _.values(data)[1]);
};

var assignKeys = function(name) {
  return _.object(_.keys(data), name);
};

result = _.map(combineNames(), function(name) {
  return assignKeys(name);
});
 
// [{first: "Alvaro", last: "Carrasco"}, {first: "Lewis", last: "Moronta"}, ...]
console.log(result);