astronautArrays.js

var moonWalkers = [
  "Neil Armstrong",
  "Buzz Aldrin",
  "Pete Conrad",
  "Alan Bean",
  "Alan Shepard",
  "Edgar Mitchell",
  "David Scott",
  "James Irwin",
  "John Young",
  "Charles Duke",
  "Eugene Cernan",
  "Harrison Schmitt"
];

function alphabetizer(names) {
    var newNames = [];
    for(var i = 0; i < names.length; i++) {
        var newName = names[i].split(' ');
        var lastName = newName[1];
        var firstName = newName[0];
        
        newNames.push(lastName + ", " + firstName);
    }
    
    return newNames.sort();
}

// Try logging your results to test your code!
console.log(alphabetizer(moonWalkers));