Xerillius · Xerillius · Aug 17, 2019 · Aug 17, 2019 · Aug 17, 2019 · Aug 17, 2019
diff --git a/README.md b/README.md
@@ -30,14 +30,28 @@ Edit this document to include your answers after each question. Make sure to lea
 
 1. Describe the biggest difference between `.forEach` & `.map`.
 
+.forEach runs a function on each array element, where .map can create an array where the values are the output of the function run on each element
+
 2. What is the difference between a function and a method?
 
+methods are called on objects and functions are not
+example:  Object.Method() vs let thing = function(args)
+
 3. What is closure?
 
+closure is a nested function's ability to access variables from higher up in the function scope
+
 4. Describe the four rules of the 'this' keyword.
 
+--1. Window binding - the scope of 'this' will refer to the top level window object
+--2. Implicit binding - the scope of 'this' will refer to the object using it
+--3. New binding - the scope of 'this' refers to the instance of the object that uses it
+--4. Explicit binding - the scope of 'this' refers to the object that used the call method to inherit the attribute 'this' is referring to
+
 5. Why do we need super() in an extended class?
 
+to assign values to variables that have been inherited from the super class
+
 ## 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 +1,31 @@
 // 1. Copy and paste your prototype in here and refactor into class syntax.
+class cuboidMaker {
+    constructor(length, height, width){
+        this.length = length;
+        this.width = width;
+        this.height = 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 cuboidClass = new cuboidMaker(4, 5, 5);
 
 // Test your volume and surfaceArea methods by uncommenting the logs below:
-// console.log(cuboid.volume()); // 100
-// console.log(cuboid.surfaceArea()); // 130
+console.log(cuboidClass.volume()); // 100
+console.log(cuboidClass.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(length, height, width){
+        super(length, height, width);
+    }
+    volume () {return this.length * this.height * this.width}
+    surfaceArea() {return (6 * (this.length * this.height))}
+}
+
+const cube = new CubeMaker(5, 5, 5);
 
-// 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(cube.volume());
+console.log(cube.surfaceArea());
diff --git a/challenges/functions.js b/challenges/functions.js
@@ -7,25 +7,31 @@
   * In the body of the function return the callback with the two parameters that you created
 */
 
+const consume = (param1, param2, cb) => {console.log(cb(param1, param2))};
+
 
 /* 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!"
 */
 
+const add = (param1, param2) => {return param1 + param2};
+const multiply = (param1, param2) => {return param1 * param2};
+const greeting = (param1, param2) => {return `Hello ${param1} ${param2}, nice to meet you!`};
+
 
 /* Step 3: Check your work by un-commenting the following calls to consume(): */
-// consume(2,2,add); // 4
-// consume(10,16,multiply); // 160
-// consume("Mary","Poppins", greeting); // Hello Mary Poppins, nice to meet you!
+ consume(2,2,add); // 4
+ consume(10,16,multiply); // 160
+ 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: 
+// Explanation: because nestedFunction is within the scope of the parent function that internal is declared in
 
 
 const external = "I'm outside the function";

diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js
@@ -6,6 +6,12 @@
   object name, diet, weight, length, period
 */
 
+const dinosaurs = [
+  {name: "tyrannosaurus", diet: "carnivorous", weight: "7000kg", length: "12m", period: "Late Cretaceous"},
+  {name: "stegosaurus", diet: "herbivorous", weight: "2000kg", length: "9m", period: "Late Jurassic"},
+  {name: "velociraptor", diet: "carnivorous", weight: "15kg", length: "1.8m", period: "Late Cretaceous"}
+]
+
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
 
 // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic
@@ -15,20 +21,20 @@
 // Using your dinosaur objects, log answers to these questions:
 
 // How much did tyrannosaurus weigh?
-console.log();
+console.log(dinosaurs[0].weight);
 
 // What was the diet of a velociraptor?
-console.log();
+console.log(dinosaurs[2].diet);
 
 // How long was a stegosaurus?
-console.log();
+console.log(dinosaurs[1].length);
 
 // What time period did tyrannosaurus live in?
-console.log();
-
+console.log(dinosaurs[0].period);
 
 // Create a new roar method for the tyrannosaurus.  When called, return "RAWERSRARARWERSARARARRRR!" Log the result.
-console.log();
+dinosaurs[0].roar = function() {return "RAWERSRARARWERSARARARRRR!"};
+console.log(dinosaurs[0].roar());
 
 
 // ==== Arrays ====
@@ -50,6 +56,8 @@ const graduates = [{"id":1,"first_name":"Cynde","university":"Missouri Southern
 
 Once you have the new array created, sort the universities alphabetically and log the result. */
 const universities = [];
+graduates.forEach(element => {universities.push(element.university)})
+universities.sort();
 console.log(universities)
 
 /* Request 2: Create a new array called contactInfo that contains both first name and email of each student. 
@@ -59,11 +67,13 @@ Name [email protected]
 
 Log the result of your new array. */
 const contactInfo = [];
+graduates.map(element => {contactInfo.push(element.first_name + " " + element.email)})
 console.log(contactInfo);
 
 
 /* Request 3: Find out how many universities have the string "Uni" included in their name. Create a new array called uni that contains them all. Log the result. */
 const uni = [];
+graduates.map(element => {(/uni/ig).exec(element.university) ? uni.push(element) : false})
 console.log(uni);
 
 
@@ -89,6 +99,7 @@ The zoo wants to display both the scientific name and the animal name in front o
 
 */
 const animalNames = [];
+zooAnimals.forEach(element => {animalNames.push(`Name: ${element.animal_name}, Scientific: ${element.scientific_name}.`)})
 console.log(animalNames);
 
 /* Request 2: .map()    
@@ -97,7 +108,7 @@ The zoos need a list of all their animal's names (names only, not scientific) co
 
 */
 
-const lowerCase = [];
+const lowerCase = zooAnimals.map(element => {return element.animal_name.toLowerCase()})
 console.log(lowerCase); 
 
 /* Request 3: .filter() 
@@ -106,14 +117,15 @@ The zoos are concenred about animals with a lower population count. Find out whi
 
 */
 const lowerPopulation = [];
+zooAnimals.filter(element => {element.population < 5 ? lowerPopulation.push(element.animal_name) : false})
 console.log(lowerPopulation);
 
 /* 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.
 
 */
-const populationTotal = 0;
+const populationTotal = zooAnimals.reduce((total, element) => total += element.population, 0);
 console.log(populationTotal);
 
 

diff --git a/challenges/prototypes.js b/challenges/prototypes.js
@@ -5,6 +5,11 @@
 /* == Step 1: Base Constructor ==
   Create a constructor function named CuboidMaker that accepts properties for length, width, and height
 */
+function CuboidMaker(length, width, height) {
+  this.length = length;
+  this.width = width;
+  this.height = height;
+}
 
 
 /* == Step 2: Volume Method ==
@@ -13,21 +18,23 @@
   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(4, 5, 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