Using this vs let in objects for "Make a Person" challenge

For this problem I initially used this.first, this.last, this.fullName which didn’t pass the test. It was when I made variables out of first, last and fullName did I pass the challenge.
I am still unsure why it didn’t work with this.first… I thought this.first would be considered a local variable first which is same as local variable let first?
I would appreciate if someone can please guide and clarify this. Thank you.
Make A person

var Person = function(firstAndLast) {
  // Only change code below this line
  // Complete the method below and implement the others similarly
  let first = firstAndLast.split(" ")[0];
  let last = firstAndLast.split(" ")[1];
  let fullName = first + " " + last;
  this.setFirstName = function(fName) {
    first = fName;
  this.setLastName = function(lName){
    last = lName;
  this.setFullName = function(fullName){
    first = fullName.split(" ")[0];
    last = fullName.split(" ")[1];
    fullName = first + " " + last;
  this.getFullName = function() {
    return first + " " + last;
  this.getFirstName = function(){
    return first;
  this.getLastName = function() {
    return last;
  return firstAndLast;

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

no, this make it a property of the object, that means that you can also do bob.firstName = "Mike"
but instead you want Person to be manipulated only through the 6 methods you have defined, and local variables are not accessible from outside.

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