SRattacasa · SRattacasa · Mar 23, 2020 · Mar 23, 2020 · Mar 23, 2020
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`.
 
+A memorable difference between them is that foreach returns undefined, and map returns a modified array.
+
 2. What is the difference between a function and a method?
 
+A method is a function on an object.
+
 3. What is closure?
 
+Closure allows for the "extended existance" of a variable that would otherwise have ended when a function executed.
+
 4. Describe the four rules of the 'this' keyword.
 
+Global binding is a global scoped "this" that binds to window or the top level object
+Implicit is whatever is calling the function, the thing before the dot
+New binding is whenever new is called and an object is created and returned by a constructor function
+Explicit is explit-- there's a call or apply to set "this"
+
+
 5. Why do we need super() in an extended class?
 
+To access the methods part of the parent 
+
 ## 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 +1,27 @@
 // 1. Copy and paste your prototype in here and refactor into class syntax.
+class CuboidMaker { 
+    constructor(length, width, height) {
+    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 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
 
-// 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 CuboidMaker { 
+    constructor(length, width, height) { 
+        super();
+    }
+
+}
diff --git a/challenges/functions.js b/challenges/functions.js
@@ -7,26 +7,31 @@
   * The consume function should return the invocation of cb, passing a and b into cb as arguments
 */
 
+const consume = function(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 (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: 
-
+// It is a part of of the myFunction scope, so when that is instantiated it makes the variable available to the nestedFunction call. It's within its scope.
 
 const external = "I'm outside the function";
 

diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js
@@ -7,51 +7,121 @@
 */
 
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
-
+const tyrannosaurus = {
+  diet: "carnivorous",
+  weight: "7000kg",
+  length: "12m",
+  period: "Late Cretaceous",
+  roar: function() {
+    return "RAWERSRARARWERSARARARRRR!";
+  }
+};
 // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic
-
+const stegosaurus = {
+  diet: "herbivorous",
+  weight: "2000kg",
+  length: "9m",
+  period: "Late Jurassic"
+};
 // velociraptor, carnivorous, 15kg, 1.8m, Late Cretaceous
-
+const 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(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();
-
+console.log(tyrannosaurus.period);
 
 // 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 = [
-  { 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]" },
-  { id: 4, first_name: "Modestine", university: "International Medical & Technological University", email: "[email protected]" },
-  { id: 5, first_name: "Chick", university: "Sultan Salahuddin Abdul Aziz Shah Polytechnic", email: "[email protected]" },
-  { id: 6, first_name: "Jakob", university: "Fachhochschule Rosenheim, Hochschule für Technik und Wirtschaft", email: "[email protected]" },
-  { id: 7, first_name: "Robbi", university: "Salem University", email: "[email protected]" },
-  { id: 8, first_name: "Colline", university: "Coastal Carolina University", email: "[email protected]" },
-  { id: 9, first_name: "Michail", university: "Universidad Católica de Ávila", email: "[email protected]" },
-  { id: 10, first_name: "Hube", university: "Universitat Rovira I Virgili Tarragona", 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]"
+  },
+  {
+    id: 4,
+    first_name: "Modestine",
+    university: "International Medical & Technological University",
+    email: "[email protected]"
+  },
+  {
+    id: 5,
+    first_name: "Chick",
+    university: "Sultan Salahuddin Abdul Aziz Shah Polytechnic",
+    email: "[email protected]"
+  },
+  {
+    id: 6,
+    first_name: "Jakob",
+    university:
+      "Fachhochschule Rosenheim, Hochschule für Technik und Wirtschaft",
+    email: "[email protected]"
+  },
+  {
+    id: 7,
+    first_name: "Robbi",
+    university: "Salem University",
+    email: "[email protected]"
+  },
+  {
+    id: 8,
+    first_name: "Colline",
+    university: "Coastal Carolina University",
+    email: "[email protected]"
+  },
+  {
+    id: 9,
+    first_name: "Michail",
+    university: "Universidad Católica de Ávila",
+    email: "[email protected]"
+  },
+  {
+    id: 10,
+    first_name: "Hube",
+    university: "Universitat Rovira I Virgili Tarragona",
+    email: "[email protected]"
+  }
 ];
 
 /* Request 1: Create a new array called universities that contains all the universities in the graduates array. This will be an array of strings.
 
 Once you have the new array created, 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.
@@ -61,28 +131,83 @@ 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++) {
+  let name = graduates[i].first_name;
+  let email = graduates[i].email;
+  let nameEmail = `${name}, ${email}`;
+  contactInfo.push(nameEmail);
+}
 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 = [];
+const unisWithUni = graduates.filter(word => word.university.includes("Uni"));
 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 = [
-  { 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" },
-  { animal_name: "White-cheeked pintail", population: 1, scientific_name: "Anas bahamensis", state: "Oregon" },
-  { animal_name: "Black-backed jackal", population: 2, scientific_name: "Canis mesomelas", state: "Washington" },
-  { animal_name: "Brolga crane", population: 9, scientific_name: "Grus rubicundus", state: "New Mexico" },
-  { animal_name: "Common melba finch", population: 5, scientific_name: "Pytilia melba", state: "Pennsylvania" },
-  { animal_name: "Pampa gray fox", population: 10, scientific_name: "Pseudalopex gymnocercus", state: "Connecticut" },
-  { animal_name: "Hawk-eagle, crowned", population: 10, scientific_name: "Spizaetus coronatus", state: "Florida" },
-  { animal_name: "Australian pelican", population: 5, scientific_name: "Pelecanus conspicillatus", state: "West Virginia" },
+  {
+    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"
+  },
+  {
+    animal_name: "White-cheeked pintail",
+    population: 1,
+    scientific_name: "Anas bahamensis",
+    state: "Oregon"
+  },
+  {
+    animal_name: "Black-backed jackal",
+    population: 2,
+    scientific_name: "Canis mesomelas",
+    state: "Washington"
+  },
+  {
+    animal_name: "Brolga crane",
+    population: 9,
+    scientific_name: "Grus rubicundus",
+    state: "New Mexico"
+  },
+  {
+    animal_name: "Common melba finch",
+    population: 5,
+    scientific_name: "Pytilia melba",
+    state: "Pennsylvania"
+  },
+  {
+    animal_name: "Pampa gray fox",
+    population: 10,
+    scientific_name: "Pseudalopex gymnocercus",
+    state: "Connecticut"
+  },
+  {
+    animal_name: "Hawk-eagle, crowned",
+    population: 10,
+    scientific_name: "Spizaetus coronatus",
+    state: "Florida"
+  },
+  {
+    animal_name: "Australian pelican",
+    population: 5,
+    scientific_name: "Pelecanus conspicillatus",
+    state: "West Virginia"
+  }
 ];
 
 /* Request 1: .forEach()
@@ -91,6 +216,7 @@ 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()
@@ -99,29 +225,31 @@ 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.toLocaleLowerCase()
+);
 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;
+function sum(acc, val) { return acc + val}
+let populationArr = zooAnimals.map(e => e.population);
+let populationTotal = populationArr.reduce(sum, 0);
 console.log(populationTotal);
 
-
 /*
 
 Stretch: If you haven't already, convert your array method callbacks into arrow functions.
 
 */
-