"completed mvp"

index.js

@@ -15,11 +15,23 @@
         + It should return a string with `name` and `age`. Example: "Mary, 50"
 */
 
-function Person() {
-
+function Person(name, age) {
+  this.name = name;
+  this.age = age;
+  this.stomach = [];
 }
+Person.prototype.eat = function(edible){
+  if(this.stomach.length < 10){
+    this.stomach.push(edible);
+  }
 
-
+}
+Person.prototype.poop = function(){
+  this.stomach = [];
+}
+Person.prototype.toString = function(){
+  return `${this.name}, ${this.age}`;
+}
 /*
   TASK 2
     - Write a Car constructor that initializes `model` and `milesPerGallon` from arguments.
@@ -36,8 +48,14 @@ function Person() {
         + The `drive` method should return a string "I ran out of fuel at x miles!" x being `odometer`.
 */
 
-function Car() {
-
+function Car(model, mpg) {
+  this.model = model;
+  this.milesPerGallon = mpg;
+  this.tank = 0;
+  this.odometer = 0;
+}
+Car.prototype.fill = function(gallons){
+  this.tank = this.tank + gallons;
 }
 
 
@@ -49,18 +67,21 @@ function Car() {
         + Should return a string "Playing with x", x being the favorite toy.
 */
 
-function Baby() {
-
+function Baby(name, age, favoriteToy) {
+Person.call(this, name, age);
+this.favoriteToy = favoriteToy;
+}
+Baby.prototype = Object.create(Person.prototype);
+Baby.prototype.play = function(){
+  return `Playing with ${this.favoriteToy}`;
 }
-
-
 /* 
   TASK 4
   In your own words explain the four principles for the "this" keyword below:
-  1. 
-  2. 
-  3. 
-  4. 
+  1. window binding -when no other rules apply will return the window/global object in undefined in strict mode.
+  2. implicit binding - this is refered to when we look at a function that invoked we look to the left of the dot.
+  3. explicit binding - this refers to the .call , . apply, and .bind".
+  4. new binding - This is when a constructor function is created this points to the new object created.
 */
 
 ///////// END OF CHALLENGE /////////