tlaudahl · tlaudahl · Aug 23, 2019 · Aug 23, 2019 · Aug 23, 2019 · Aug 23, 2019
diff --git a/README.md b/README.md
@@ -30,14 +30,32 @@ Edit this document to include your answers after each question. Make sure to lea
 
 1. Describe the biggest difference between `.forEach` & `.map`.
 
+    Biggest difference is forEach doesn't create or return a new array and map does return a new array
+
 2. What is the difference between a function and a method?
 
+    A method is a function inside of an object a regular function is not inside an object
+
 3. What is closure?
 
+    Closure allows nested functions to have access to its parent functions parameters and variables
+    even after the parent function has returned
+
 4. Describe the four rules of the 'this' keyword.
 
+    Window Binding - if 'use strict' is not implied this will default to the global window object, if it is
+    implied it will return undefined
+
+    Implicit Binding - whatever is on the left of the dot will be referred to as this
+
+    Explicit Binding - using call, apply, or bind will tell the JavaScript engine what to refer to this as
+
+    New Binding - The object created with the new binding will be referred to as this
+
 5. Why do we need super() in an extended class?
 
+    super() does what .bind and .call do in one. It will give us access to the parents properties and methods
+
 ## Project Set up
 
 Follow these steps to set up and work on your project:

diff --git a/challenges/classes.js b/challenges/classes.js
@@ -1,7 +1,57 @@
 // 1. Copy and paste your prototype in here and refactor into class syntax.
 
+/*
+function CuboidMaker(sides) {
+    this.length = sides.length;
+    this.width = sides.width;
+    this.height = sides.height;
+}
+*/
+
+class CuboidMaker{
+    constructor(sides) {
+        this.length = sides.length;
+        this.width = sides.width;
+        this.height = sides.height;
+    }
+    volume() {
+        return this.length * this.width * this.height;
+    }
+    surfaceArea() {
+        return 2 * (this.length * this.width + this.length * this.height + this.width * this.height);
+    }
+}
+
+
+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
+
+// 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 CuboidMaker {
+    constructor(sides) {
+        super(sides);
+    }
+    cubeSurfaceArea() {
+        return 6 * Math.pow(this.length, 2);
+    }
+    cubeVolume() {
+        return Math.pow(this.length, 3);
+    }
+}
+
+const newCube = new CubeMaker({
+    length: 6,
+    width: 6,
+    height: 6,
+})
 
-// 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.
+console.log(newCube.cubeVolume());
+console.log(newCube.surfaceArea());
diff --git a/challenges/functions.js b/challenges/functions.js
@@ -7,25 +7,41 @@
   * The consume function should return the invocation of cb, passing a and b into cb as arguments
 */
 
+function consume(a, b, cb) {
+  return cb(a,b);
+}
 
 /* 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(a,b) {
+  return a + b;
+}
+
+function multiply(a,b) {
+  return a * b;
+}
+
+function greeting(first, last) {
+  return `Hello ${first} ${last}, 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.
+// Explain in your own words why nested function can access the variable internal.
+
+// Explanation:
 
-// Explanation: 
+//  An inner function always has access to the variables and parameters of its parent function, even after it has returned
 
 
 const external = "I'm outside the function";

diff --git a/challenges/index.html b/challenges/index.html
@@ -9,7 +9,7 @@
 
   <script src="objects-arrays.js"></script>
   <script src="functions.js"></script>
-  <script src="prototypes.js"></script>
+  <!-- <script src="prototypes.js"></script> -->
   <script src="classes.js"></script>
 </head>
 

diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js
@@ -8,27 +8,55 @@
 
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
 
+const trex = {
+  name: 'Tyrannosaurus',
+  diet: 'carnivorous',
+  weight: '7000kg',
+  length: '12m',
+  period: 'Late Cretacrous',
+  roar: function() {
+    return "RAWERSRARARWERSARARARRRR!"
+  }
+}
+
+
 // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic
 
+const stegosaurus = {
+  name: 'Stegosaurus',
+  diet: 'Herbivorous',
+  weight: '2000kg',
+  length: '9m',
+  period: 'Late Jurassic',
+}
+
 // velociraptor, carnivorous, 15kg, 1.8m, Late Cretaceous
 
+const velociraptor = {
+  name: 'Velociraptor',
+  diet: 'Carnivorous',
+  weight: '15kg',
+  length: '1.8m',
+  period: 'Late Cretaceous',
+}
+
 // Using your dinosaur objects, log answers to these questions:
 
 // How much did tyrannosaurus weigh?
-console.log();
+console.log(trex.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();
+console.log(trex.period);
 
 
 // Create a new roar method for the tyrannosaurus.  When called, return "RAWERSRARARWERSARARARRRR!" Log the result.
-console.log();
+console.log(trex.roar());
 
 
 // ==== Arrays ====
@@ -52,6 +80,8 @@ const graduates = [
 
 Once you have the new array created, sort the universities alphabetically and log the result. */
 const universities = [];
+graduates.forEach(e => universities.push(e.university));
+universities.sort((a,b) => a > b)
 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.
@@ -61,10 +91,12 @@ The resulting contact information strings should have a space between the first
 
 Log the result of your new array. */
 const contactInfo = [];
+graduates.forEach(e => contactInfo.push(`${e.first_name} ${e.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 = [];
+graduates.forEach(e => e.university.includes('Uni') ? unisWithUni.push(e.university) : null)
 console.log(unisWithUni);
 
 
@@ -91,6 +123,7 @@ The zoos want to display both the scientific name and the animal name in front o
 
 */
 const displayNames = [];
+zooAnimals.forEach(e => displayNames.push(`Name: ${e.animal_name}, Scientific: ${e.scientific_name}`))
 console.log(displayNames);
 
 /* Request 2: .map()
@@ -99,23 +132,23 @@ The zoos need a list of all their animal's names (animal_name only) converted to
 
 */
 
-const lowCaseAnimalNames = [];
+const lowCaseAnimalNames = zooAnimals.map(e => e.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(e => e.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((acc, curr) => acc + curr.population, 0);
 console.log(populationTotal);
 
 

diff --git a/challenges/prototypes.js b/challenges/prototypes.js
@@ -5,29 +5,45 @@
 /* == Step 1: Base Constructor ==
   Create a constructor function named CuboidMaker that accepts properties for length, width, and height
 */
-
+function CuboidMaker(sides) {
+  this.length = sides.length;
+  this.width = sides.width;
+  this.height = sides.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