LDinho · LDinho · Jan 26, 2019 · Jan 26, 2019 · Jan 26, 2019 · Jan 26, 2019
diff --git a/.gitignore b/.gitignore
@@ -1 +1,2 @@
 .DS_Store
+.idea
diff --git a/README.md b/README.md
@@ -30,14 +30,27 @@ Edit this document to include your answers after each question. Make sure to lea
 
 1. Describe the biggest difference between `.forEach` & `.map`.
 
+* `.map` returns a new array while still passing each element back to the callback function. `.forEach` does not return anything.
+
 2. What is the difference between a function and a method?
 
+* Functions and methods are both functions in JS. A method is just a property of an object whose value is a function.
+
 3. What is closure?
 
+* A closure is the combo of a function and the lexical environment within which that function was declared. It's when you have nested functions where variables from outer functions can be accessed within the inner functions.
+
 4. Describe the four rules of the 'this' keyword.
 
+    - global binding - `this` refers to the window object.
+    - implicit binding - `this` refers to the object that is left of the dot that precedes the function being called.
+    - explicit binding - `this` can be defined explicitly with the use of `.call` and `.apply`.
+    - new binding - `this` refers to a specific instance of a created object with the `new` keyword.
+
 5. Why do we need super() in an extended class?
 
+* We use `super()` to call the Parent's class constructor.
+
 ## 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 +1,50 @@
 // 1. Copy and paste your prototype in here and refactor into class syntax.
 
+class CuboidMaker2 {
+  constructor(props) {
+    this.length = props.length;
+    this.width = props.width;
+    this.height = props.height;
+  }
+
+  volume() {
+    return this.length * this.width * this.height;
+  }
+
+  surfaceArea() {
+    return 2 * (this.length * this.width + this.length * this.height + this.width * this.height);
+  }
+}
+
+class CubeMaker extends CuboidMaker {
+  constructor(props) {
+    super(props);
+  }
+
+  volume() {
+    return Math.pow(this.length, 3);
+  }
+
+  surfaceArea() {
+    return 6*(Math.pow(this.length,2))
+  }
+}
+
+const cuboid2 = new CuboidMaker2({
+  length: 4,
+  width: 5,
+  height: 5
+})
+
+const cube = new CubeMaker({
+  length: 2,
+})
+
 // Test your volume and surfaceArea methods by uncommenting the logs below:
-// console.log(cuboid.volume()); // 100
-// console.log(cuboid.surfaceArea()); // 130
+console.log(cuboid2.volume()); // 100
+console.log(cuboid2.surfaceArea()); // 130
+
+console.log(cube.volume()); // 8
+console.log(cube.surfaceArea()); // 24
 
-// 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.
diff --git a/challenges/functions.js b/challenges/functions.js
@@ -1,32 +1,49 @@
-// ==== Callbacks ====  
+// ==== Callbacks ====
 
 /* Step 1: Create a higher-order function that accepts a callback
   * Create a higher-order function named consume that can take 3 parameters.
   * The first two parameters can accept any argument
-  * The last parameter accepts a callback 
+  * The last parameter accepts a callback
   * In the body of the function return the callback with the two parameters that you created
 */
-
+function consume(arg1, arg2, callback) {
+  return callback(arg1, arg2);
+}
 
 /* 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 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(num1, num2) {
+  return num1 + num2;
+}
+
+function multiply(num1, num2) {
+  return num1 * num2;
+}
+
+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(): */
-// consume(2,2,add); // 4
-// consume(10,16,multiply); // 160
-// 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 ==== 
+// ==== Closures ====
 
 // Explain in your own words why `nestedfunction()` can access the variable `internal`.
 
-// Explanation: 
-
+// Explanation:
+/*
+When `nestedFunction` is declared, a new functional scope is created.
+ It will always be able to access variables outward of its scope no matter
+ how deep it is created within the lexical environment -- this is due to closure.
+ */
 
 const external = "I'm outside the function";
 
@@ -39,4 +56,4 @@ function myFunction() {
   };
   nestedFunction();
 }
-myFunction();
+myFunction();
diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js
@@ -1,8 +1,8 @@
 // ==== Objects ====
 
-/* 
-  Given the following information about dinosaurs, create 3 objects: 
-  Use this pattern to create your objects: 
+/*
+  Given the following information about dinosaurs, create 3 objects:
+  Use this pattern to create your objects:
   object name, diet, weight, length, period
 */
 
@@ -12,23 +12,50 @@
 
 // velociraptor, carnivorous, 15kg, 1.8m, Late Cretaceious
 
+const tyrannosaurus = {
+  name: 'tyrannosaurus',
+  diet: 'carnivorous',
+  weight: '7000kg',
+  length: '12m',
+  period:  'Late Cretaceious',
+  roar: function() {
+    return "RAWERSRARARWERSARARARRRR!";
+  }
+}
+
+const stegosaurus = {
+  name: 'stegosaurus',
+  diet: 'herbivorous',
+  weight: '2000kg',
+  length: '9m',
+  period:  'Late Jurassic',
+}
+
+const velociraptor = {
+  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();
+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 ====
@@ -46,24 +73,47 @@ const graduates = [{"id":1,"first_name":"Cynde","university":"Missouri Southern
 {"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 univeristies in the graduates array.  
+/* Request 1: Create a new array called universities that contains all the univeristies in the graduates array.
 
 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++) {
+  const school = graduates[i].university;
+  universities.push(school);
+}
+
+universities.sort();
+
 console.log(universities)
 
-/* Request 2: Create a new array called contactInfo that contains both first name and email of each student. 
+/* Request 2: Create a new array called contactInfo that contains both first name and email of each student.
 
-The resulting contact information should have a space between the first name and the email information like this: 
+The resulting contact information should have a space between the first name and the email information like this:
 Name [email protected]
 
 Log the result of your new array. */
 const contactInfo = [];
+
+for (let i = 0; i < graduates.length; i++) {
+  const name = graduates[i].first_name;
+  const email = graduates[i].email;
+  contactInfo.push(`${name} ${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 = [];
+
+for (let i = 0; i < graduates.length; i++) {
+  const school = graduates[i].university
+  if (school.includes('Uni')) {
+    uni.push(school);
+  }
+}
+
 console.log(uni);
 
 
@@ -89,35 +139,71 @@ The zoo wants to display both the scientific name and the animal name in front o
 
 */
 const animalNames = [];
+
+// zooAnimals.forEach(function(animal) {
+//   animalNames.push(`Name: ${animal.animal_name}, Scientific: ${animal.scientific_name}`);
+// })
+
+zooAnimals.forEach(animal => {
+  animalNames.push(`Name: ${animal.animal_name}, Scientific: ${animal.scientific_name}`);
+})
+
 console.log(animalNames);
 
-/* Request 2: .map()    
+/* Request 2: .map()
 
 The zoos need a list of all their animal's names (names only, not scientific) converted to lower case.  Create a new array named lowerCase and map over each name to convert them all to lower case.  Log the resut.
 
 */
 
 const lowerCase = [];
-console.log(lowerCase); 
 
-/* Request 3: .filter() 
+// zooAnimals.map(function(animal) {
+//   let name = animal.animal_name;
+//   return lowerCase.push(name.toLowerCase());
+// })
+
+zooAnimals.map(animal => {
+  let name = animal.animal_name;
+  return lowerCase.push(name.toLowerCase());
+})
+
+console.log(lowerCase);
 
-The zoos are concenred about animals with a lower population count. Find out which animals have a population less than 5.
+/* Request 3: .filter()
+
+The zoos are concerned about animals with a lower population count. Find out which animals have a population less than 5.
 
 */
-const largerPopulation = [];
-console.log(largerPopulation);
+// const lowPopulation = [];
+
+// const lowPopulation = zooAnimals.filter(function(animal) {
+//   return animal.population < 5;
+// })
 
-/* Request 4: .reduce() 
+const lowPopulation = zooAnimals.filter(animal => animal.population < 5);
+
+console.log(lowPopulation);
+
+/* 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 = 0;
+
+// const populationTotal = zooAnimals.reduce(function(acc, animal) {
+//   return acc + animal.population;
+// }, 0);
+
+const populationTotal = zooAnimals.reduce((acc, animal) => {
+  return acc + animal.population;
+}, 0);
+
 console.log(populationTotal);
 
 
-/* 
+/*
 
 Stretch: If you haven't already, convert your array method callbacks into arrow functions.