HW SunJieMing#3 done, better late that never! Still chugging along!

exercises.js

@@ -7,68 +7,108 @@ function makeCat(name, age) {
   //add an age property to the object with the value set to the age argument
   //add a method called meow that returns the string 'Meow!'
   //return the object
+  var obj = {
+    meow: function(){
+      return 'Meow!';
+    }
+  };
+  obj.name = name;
+  obj.age = age;
+  return obj;
 }
 
 function addProperty(object, property) {
   //add the property to the object with a value of null
   //return the object
   //note: the property name is NOT 'property'.  The name is the value of the argument called property (a string)
+  object[property] = null;
+  return object;
 }
 
 function invokeMethod(object, method) {
   //method is a string that contains the name of a method on the object
   //invoke this method
   //nothing needs to be returned
+  object[method]();
 }
 
 function multiplyMysteryNumberByFive(mysteryNumberObject) {
   //mysteryNumberObject has a property called mysteryNumber
   //multiply the mysteryNumber property by 5 and return the product
+  return mysteryNumberObject.mysteryNumber * 5;
 }
 
 function deleteProperty(object, property) {
   //remove the property from the object
   //return the object
+  delete object[property];
+  return object;
 }
 
 function newUser(name, email, password) {
   //create a new object with properties matching the arguments passed in.
   //return the new object
+  var object = {
+    name: name,
+    email: email,
+    password: password
+  };
+  return object;
 }
 
 function hasEmail(user) {
   //return true if the user has a value for the property 'email'
   //otherwise return false
+   if (user['email']){
+    return true;
+   }
+   else{
+    return false;
+   }
 }
 
 function hasProperty(object, property) {
   //return true if the object has the value of the property argument
   //property is a string
   //otherwise return false
+  return object.hasOwnProperty(property);
 }
 
 function verifyPassword(user, password) {
   //check to see if the provided password matches the password property on the user object
   //return true if they match
-  //otherwise return false
+  //otherwise return false  
+  if (user.password === password){
+     return true;
+   }else{
+     return false;
+   } 
 }
 
 function updatePassword(user, newPassword) {
   //replace the existing password on the user object with the value of newPassword
   //return the object
+  user.password = newPassword;
+  return user;
 }
 
 function addFriend(user, newFriend) {
   //user has a property called friends that is an array
   //add newFriend to the end of the friends array
   //return the user object
+  user.friends.push(newFriend);
+  return user;
 }
 
 function setUsersToPremium(users) {
   //users is an array of user objects.
   //each user object has the property 'isPremium'
   //set each user's isPremium property to true
   //return the users array
+   for (var i=0; i<users.length; i++ ){
+      users[i]['isPremium'] = true;
+   }
+return users;
 }
 
 function sumUserPostLikes(user) {
@@ -77,6 +117,13 @@ function sumUserPostLikes(user) {
   //each post object has an integer property called 'likes'
   //sum together the likes from all the post objects
   //return the sum
+  var emptyArr = [];
+   user['posts'].forEach(function(el){
+     emptyArr.push(el['likes']);
+   });
+  return emptyArr.reduce(function(a,b){
+      return a+b;
+    });
 }
 
 function addCalculateDiscountPriceMethod(storeItem) {
@@ -87,6 +134,10 @@ function addCalculateDiscountPriceMethod(storeItem) {
   //price -> 20
   //discountPercentage -> .2
   //discountPrice = 20 - (20 * .2)
+  storeItem.calculateDiscountPrice = function(){
+    return this.price * (1-this.discountPercentage);
+  };
+  return storeItem;
 }
 
 //Do not modify code below this line.