HW #3 Submission

README.md

@@ -4,11 +4,15 @@
 ---
 1. Feynman Writing Prompts - Write out explanations of the following concepts like you are explaining it to a 12 year old.  Doing this will help you quickly discover any holes in your understanding.  Ask your questions on Slack.
 
-	* Objects
-	* Properties
-	* Methods
-	* for in loop
-	* Dot notation vs bracket notation
+	* `Objects`: A collection of data which consists of various variables and functions which are called
+	properties and methods.  
+	* `Properties`: Variables or pieces of data that hold values pertaining to the specific property. 
+	An object can have various properties.
+	* `Methods`: Are usually functions which add functunonality to the object.
+	* `for in loop`: Iterates over the enumerable object properties, For each distinct propert, 
+	statements can be executed.
+	* `Dot notation vs bracket notation`: Ways of accessing properties. The difference between these two is
+	that bracket notation property identifiers have to be a string.
 
 
 2. Fork and clone this repo.  When you need to commit use the following commands.

exercises.js

@@ -5,68 +5,104 @@ 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 cat = {
+    name: name,
+    age : age,
+    meow: function(){return 'Meow!';}
+  };
+  return cat;
 }
 
 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 x = {
+    name: name,
+    email: email,
+    password: password
+  };
+  return x;
 }
 
 function hasEmail(user) {
   // return true if the user has a value for the property 'email'
   // otherwise return false
+  if(user.email){
+    return true;
+  }
+  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
+  if(object.hasOwnProperty(property)){
+    return true;
+  }
+  return false;
 }
 
 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
+  if(user.password === password){
+    return true;
+  }
+  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) {
@@ -75,6 +111,11 @@ 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 likes = 0;
+  for(var i in user.posts){
+    likes += user.posts[i].likes;
+  }
+  return likes;
 }
 
 function addCalculateDiscountPriceMethod(storeItem) {
@@ -85,6 +126,12 @@ function addCalculateDiscountPriceMethod(storeItem) {
   // price -> 20
   // discountPercentage -> .2
   // discountPrice = 20 - (20 * .2)
+
+  storeItem.calculateDiscountPrice = function() {
+    var disc = this.price - (this.price * this.discountPercentage);
+    return disc;
+  };
+  return storeItem;
 }
 
 // Do not modify code below this line.