makeAPerson.js

var Person = function(firstAndLast) {
    var full_arr = firstAndLast.split(' ');
    var firstName = full_arr[0];
    var lastName = full_arr[0];
    var fullName = firstName + ' ' + lastName;
    
    // now build the methods
    function getFirstName() {
        return firstName;
    }
  
    function getLastName() {
        return lastName;
    }
    
    function getFullName() {
        return firstAndLast;
    }
  
    function setFirstName(first) {
        firstName = first;
    }
  
    function setLastName(last) {
        lastName = last;
    }
  
    function setFullName(firstAndLast) {
        fullName = firstAndLast;
    }
};

var bob = new Person('Bob Ross');
bob.getFullName();