Quyen moscoso

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`.
 
+forEach doean't return arrays or anything, map returns arrays.
+
 2. What is the difference between a function and a method?
 
+The existence of functions is independent, while methods do not have an independent existence. Method is a fuction inside an object. So methods is also function, but function may not be a method.
+
 3. What is closure?
 
+Closure means that an inner function always has access to the vars and parameters of its outer function, even after the outer function has returned.
+
 4. Describe the four rules of the 'this' keyword.
 
+Global Binding: this refers to the window/global object
+Implicit Binding: this refers to the object left of the dot
+New Binding: this refers to the new object created by constructor
+Explicit Binding: this occurs when .call(), .apply(), or .bind() are used on a function.
+
 5. Why do we need super() in an extended class?
 
+super() is used so that children objects can inherit the parent's properties and methods.
+
 ## Project Set up
 
 Follow these steps to set up and work on your project:

challenges/classes.js

@@ -1,7 +1,26 @@
 // 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 = function() {
+
+      return 2 * (this.length * this.width + this.length * this.height + this.width * this.height);
+    }
+  }  
+  let 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.

challenges/functions.js

@@ -6,19 +6,28 @@
   * The last parameter accepts a callback
   * The consume function should return the invocation of cb, passing a and b into cb as arguments
 */
+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!"
 */
+add = (a, b) => a + b;
+
+multiply = (a, b) => a * b;
+
+greeting = (firstName, lastName) => `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 ==== 

challenges/objects-arrays.js

@@ -8,27 +8,72 @@
 
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
 
+const tyrannosaurus = {
+
+  name: 'tyrannosaurus',
+
+  diet: 'carnivorous',
+
+  weight: '7000kg',
+
+  length: '12m',
+
+  period: 'Late Cretaceous'
+
+};
+
 // 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(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();
+tyrannosaurus.roar = () => {
+
+  return 'RAWERSRARARWERSARARARRRR!';
+
+}
+console.log(tyrannosaurus.roar());
 
 
 // ==== Arrays ====
@@ -51,7 +96,7 @@ const graduates = [
 /* 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, sort the universities alphabetically and log the result. */
-const universities = [];
+const universities = graduates.map(graduate => graduate.university).sort();;
 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.
@@ -60,11 +105,11 @@ The resulting contact information strings should have a space between the first
 "Josh [email protected]"
 
 Log the result of your new array. */
-const contactInfo = [];
+const contactInfo = graduates.map(graduate => `${graduate.first_name} ${graduate.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 = [];
+const unisWithUni = graduates.filter(graduate => graduate.university.includes('Uni'));
 console.log(unisWithUni);
 
 
@@ -91,6 +136,9 @@ 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()
@@ -99,23 +147,27 @@ The zoos need a list of all their animal's names (animal_name only) converted to
 
 */
 
-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);
 
 

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(length, width, height) {
 
+  this.length = length;
+
+  this.width = width;
+
+  this.height = 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.   
 */
-
+let 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