shamrock511 · shamrock511 · Sep 14, 2019 · Sep 14, 2019
diff --git a/README.md b/README.md
@@ -28,15 +28,15 @@ Demonstrate your understanding of this week's concepts by answering the followin
 
 Edit this document to include your answers after each question. Make sure to leave a blank line above and below your answer so it is clear and easy to read by your team lead
 
-1. Describe the biggest difference between `.forEach` & `.map`.
+1. Describe the biggest difference between .forEach & .map. Map returns a new array, forEach does not.
 
-2. What is the difference between a function and a method?
+2. What is the difference between a function and a method? A method is a function within an object.
 
-3. What is closure?
+3. What is closure? A closure is a chain of scope, allowing a function to have access to variables declared outside of it's scope.
 
-4. Describe the four rules of the 'this' keyword.
+4. Describe the four rules of the 'this' keyword. Globalally binds to window, implicity binds to object to the left of a dot operator, explicity binds when used with .call, .apply, or .bind, and newly binds to objects created with the new keyword.
 
-5. Why do we need super() in an extended class?
+5. Why do we need super() in an extended class? super() calls the constructor function of the extended class on the object being passed into it.
 
 ## Project Set up
 

diff --git a/challenges/classes.js b/challenges/classes.js
@@ -1,7 +1,60 @@
 // 1. Copy and paste your prototype in here and refactor into class syntax.
+class CuboidMakerClass {
+    constructor(object) {
+        this.length = object.length,
+        this.width = object.width,
+        this.height = object.height
+    }
+    // refactored volume
+    volume () {
+        return this.length * this.width * this.height;
+    }
+    // refactored surfaceArea
+    surfaceArea() {
+        return 2 * (this.length * this.width + this.length * this.height + this.width * this.height);
+    }
+}
 
 // Test your volume and surfaceArea methods by uncommenting the logs below:
-// console.log(cuboid.volume()); // 100
-// console.log(cuboid.surfaceArea()); // 130
+console.log(cuboid.volume()); // 100
+console.log(cuboid.surfaceArea()); // 130
 
-// Stretch Task: Extend the base class CuboidMaker with a sub class called CubeMaker.  Find out the formulas for volume and surface area for cubes and create those methods using the dimension properties from CuboidMaker.  Test your work by logging out your volume and surface area.
+// Stretch Task: Extend the base class CuboidMaker with a sub class called CubeMaker.  Find out the formulas for volume and surface area for cubes and create those methods using the dimension properties from CuboidMaker.  Test your work by logging out your volume and surface area.
+class CubeMaker extends CuboidMakerClass {
+    constructor (object) {
+        super(object)
+    }
+    volume () {
+        // cube volume = length^3
+        // Math.pow(base, exponent)
+        return Math.pow(this.length, 3);
+    }
+
+    surfaceArea() {
+        // cube SA = 6a^2
+        return 6 * (Math.pow(this.length, 2));
+    }
+
+}
+
+  // Create new object cuboid
+  const cuboid2 = new CuboidMakerClass({
+    length: 4,
+    width: 5,
+    height: 5
+  })
+
+  // Test
+  console.log(cuboid2.volume()); // 100
+  console.log(cuboid2.surfaceArea()); // 130
+
+  // new cube object
+  const cube = new CubeMaker({
+    length: 4,
+    width: 5,
+    height: 5
+  })
+
+  // Test
+  console.log(cube.volume()); // 64
+  console.log(cube.surfaceArea()); // 96
diff --git a/challenges/functions.js b/challenges/functions.js
@@ -6,26 +6,40 @@
   * The last parameter accepts a callback
   * The consume function should return the invocation of cb, passing a and b into cb as arguments
 */
-
+function consume( first, second, cb) {
+  return cb(first, second);
+}
 
 /* Step 2: Create several functions to callback with consume();
   * Create a function named add that returns the sum of two numbers
   * Create a function named multiply that returns the product of two numbers 
   * Create a function named greeting that accepts a first and last name and returns "Hello first-name last-name, nice to meet you!"
 */
+function add(first, second) {
+  return first + second;
+}
+
+function multiply(first, second) {
+  return first * second;
+}
+
+function greeting(firstName, lastName) {
+  return `Hello ${firstName} ${lastName}, nice to meet you!`;
+}
 
 
 /* Step 3: Check your work by un-commenting the following calls to consume(): */
-// console.log(consume(2, 2, add)); // 4
-// console.log(consume(10, 16, multiply)); // 160
-// console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice to meet you!
+console.log(consume(2, 2, add)); // 4
+console.log(consume(10, 16, multiply)); // 160
+console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice to meet you!
 
 
 // ==== Closures ==== 
 
 // Explain in your own words why nestedfunction can access the variable internal.
 
 // Explanation: 
+//on closure, nestedFunction can access variables in the parent scope, such as 'internal' in this example.
 
 
 const external = "I'm outside the function";

diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js
@@ -5,37 +5,67 @@
   Use this pattern to create your objects: 
   object name, diet, weight, length, period
 */
-
+function Dinosaur(object) {
+  this.name = object.name,
+  this.diet = object.diet,
+  this.weight = object.weight,
+  this.length = object.length,
+  this.period = object.period
+}
+
+Dinosaur.prototype.roar = function () {
+  if (this.name === 'tyrannosaurus') {
+    return 'RAWWWR';
+  }
+}
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
-
+const tyrannosaurus = new Dinosaur({
+  name: 'tyrannosaurus', 
+  diet: 'carnivorous', 
+  weight: '7000kg', 
+  length: '12m', 
+  period: 'Late Cretaceious'
+})
 // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic
-
+const stegosaurus = new Dinosaur({
+  name: 'stegosaurus', 
+  diet: 'herbivorous', 
+  weight: '2000kg', 
+  length: '9m', 
+  period: 'Late Jurassic'
+})
 // velociraptor, carnivorous, 15kg, 1.8m, Late Cretaceous
-
+const velociraptor = new Dinosaur({
+  name: 'velociraptor', 
+  diet: 'carnivorous', 
+  weight: '15kg', 
+  length: '1.8m', 
+  period: 'Late Cretaceious'
+})
 // Using your dinosaur objects, log answers to these questions:
 
 // How much did tyrannosaurus weigh?
-console.log();
+console.log(tyrannosaurus.weight);
 
 // What was the diet of a velociraptor?
-console.log();
+console.log(velociraptor.diet);
 
 // How long was a stegosaurus?
-console.log();
+console.log(stegosaurus.length);
 
 // What time period did tyrannosaurus live in?
 console.log();
 
 
 // Create a new roar method for the tyrannosaurus.  When called, return "RAWERSRARARWERSARARARRRR!" Log the result.
-console.log();
+console.log(tyrannosaurus.roar());
 
 
 // ==== Arrays ====
 
 // Given an array of college graduates.  Complete the following requests using any array method you like
 
-const graduates = [
+const graduates = [{"id":1,"first_name":"Cynde","university":"Missouri Southern State College","email":"[email protected]"},
   { id: 1, first_name: "Cynde", university: "Missouri Southern State College", email: "[email protected]" },
   { id: 2, first_name: "Saundra", university: "The School of the Art Institute of Chicago", email: "[email protected]" },
   { id: 3, first_name: "Lambert", university: "Marian College", email: "[email protected]" },
@@ -52,6 +82,9 @@ const graduates = [
 
 Once you have the new array created, sort the universities alphabetically and log the result. */
 const universities = [];
+for (let i = 0; i < graduates.length; i++) {
+  universities.push(graduates[i].university);
+}
 console.log(universities);
 
 /* Request 2: Create a new array called contactInfo that contains both first name and email of each student. This will be an array of strings.
@@ -61,18 +94,26 @@ The resulting contact information strings should have a space between the first
 
 Log the result of your new array. */
 const contactInfo = [];
+for (let i = 0; i < graduates.length; i++) {
+  contactInfo.push(`${graduates[i].first_name} ${graduates[i].email}`);
+}
 console.log(contactInfo);
 
 /* Request 3: Find out how many universities have the string "Uni" included in their name. Create a new array called unisWithUni that contains them all. This will be an array of objects. Log the result. */
 const unisWithUni = [];
+for (let i = 0; i < universities.length; i++) {
+  if (universities[i].includes('Uni')) {
+    unisWithUni.push(universities[i]);
+  }
+}
 console.log(unisWithUni);
 
 
 // ==== ADVANCED Array Methods ====
 
 // Given this zoo data from around the United States, follow the instructions below.  Use the specific array methods in the requests below to solve the problems.
 
-const zooAnimals = [
+const zooAnimals = [{"animal_name":"Jackal, asiatic","population":5,"scientific_name":"Canis aureus","state":"Kentucky"},
   { animal_name: "Jackal, asiatic", population: 5, scientific_name: "Canis aureus", state: "Kentucky" },
   { animal_name: "Screamer, southern", population: 1, scientific_name: "Chauna torquata", state: "Alabama" },
   { animal_name: "White spoonbill", population: 8, scientific_name: "Platalea leucordia", state: "Georgia" },
@@ -91,31 +132,31 @@ The zoos want to display both the scientific name and the animal name in front o
 
 */
 const displayNames = [];
+zooAnimals.forEach(animal => displayNames.push(`Name: ${animal.animal_name} Scientific: ${animal.scientific_name}`));
 console.log(displayNames);
 
 /* Request 2: .map()
 
 The zoos need a list of all their animal's names (animal_name only) converted to lower case. Using map, create a new array of strings named lowCaseAnimalNames, each string following this pattern: "jackal, asiatic". Log the resut.
 
 */
-
-const lowCaseAnimalNames = [];
+const lowCaseAnimalNames = zooAnimals.map(animal => animal.animal_name.toLowerCase());
 console.log(lowCaseAnimalNames);
 
 /* Request 3: .filter() 
 
 The zoos are concerned about animals with a lower population count. Using filter, create a new array of objects called lowPopulationAnimals which contains only the animals with a population less than 5.
 
 */
-const lowPopulationAnimals = [];
+const lowPopulationAnimals = zooAnimals.filter(animal => animal.population < 5);
 console.log(lowPopulationAnimals);
 
 /* Request 4: .reduce() 
 
 The zoos need to know their total animal population across the United States. Find the total population from all the zoos using the .reduce() method. Remember the reduce method takes two arguments: a callback (which itself takes two args), and an initial value for the count.
 
 */
-const populationTotal = 0;
+const populationTotal = zooAnimals.reduce((total, animal) => total + animal.population, 0);
 console.log(populationTotal);
 
 

diff --git a/challenges/prototypes.js b/challenges/prototypes.js
@@ -5,29 +5,43 @@
 /* == Step 1: Base Constructor ==
   Create a constructor function named CuboidMaker that accepts properties for length, width, and height
 */
-
+function CuboidMaker(object) {
+  this.length = object.length,
+  this.width = object.width,
+  this.height = object.height
+}
 
 /* == Step 2: Volume Method ==
   Create a method using CuboidMaker's prototype that returns the volume of a given cuboid's length, width, and height
 
   Formula for cuboid volume: length * width * height
 */
+CuboidMaker.prototype.volume = function () {
+  return this.length * this.width * this.height;
+}
 
 
 /* == Step 3: Surface Area Method ==
   Create another method using CuboidMaker's prototype that returns the surface area of a given cuboid's length, width, and height. 
 
   Formula for cuboid surface area of a cube: 2 * (length * width + length * height + width * height)
 */
+CuboidMaker.prototype.surfaceArea = function () {
+  return 2 * (this.length * this.width + this.length * this.height + this.width * this.height);
+}
 
 
 /* == Step 4: Create a new object that uses CuboidMaker ==
   Create a cuboid object that uses the new keyword to use our CuboidMaker constructor
   Add properties and values of length: 4, width: 5, and height: 5 to cuboid.   
 */
-
+const cuboid = new CuboidMaker({
+  length: 4,
+  width: 5,
+  height: 5
+})
 // Test your volume and surfaceArea methods by uncommenting the logs below:
-// console.log(cuboid.volume()); // 100
-// console.log(cuboid.surfaceArea()); // 130
+console.log(cuboid.volume()); // 100
+console.log(cuboid.surfaceArea()); // 130