WEBEUFLEX - Sprint-Challenge--JavaScript - Amin Hasan 🇬🇧

README.md

@@ -30,30 +30,43 @@ Edit this document to include your answers after each question. Make sure to lea
 
 1. Describe the biggest difference between `.forEach` & `.map`.
 
+Both `.forEach` & `.map` are array iterators. The big difference between them is that `.map` allows us to transform the array by creating a new one without harming the original array, whereas `.forEach` modifies the existing array.
+
 2. What is the difference between a function and a method?
 
+Everything in Javascript is an object, so a function is an object. A method is a function that's inside another function (or object).
+
 3. What is closure?
 
+A closure is a nested function which gives you access to an outer function scope.
+
 4. Describe the four rules of the 'this' keyword.
 
+* 1. Window (or Global) binding - the value of this will be the window object or the global scope where all the javascript is. This can be avoided by typing in "use strict" at the top of your code.
+* 2. Implicit binding - when a function is called by a preceding dot, whatever is to the left of the dot is what "this" will be referencing.
+* 3. New binding - when a function is invoked using the "new" keyword. These are used with the constructor function.
+* 4. Explicit binding - "call", "apply", "bind" keywords are used to override what the "this" keyword is pointing to.
+
 5. Why do we need super() in an extended class?
 
+`super()` is used for a child function which calls the parent class. It is used to avoid duplciating the constructor parts that are common between a parent and child element and providing fine control over constructor syntax.
+
 ## Project Set up
 
 Follow these steps to set up and work on your project:
 
-- [ ] Create a forked copy of this project.
-- [ ] Add TL as collaborator on Github.
-- [ ] Clone your OWN version of Repo (Not Lambda's by mistake!).
-- [ ] Create a new Branch on the clone: git checkout -b `<firstName-lastName>`.
-- [ ] Create a pull request before you start working on the project requirements.  You will continuously push your updates throughout the project.
-- [ ] You are now ready to build this project with your preferred IDE
-- [ ] Implement the project on your Branch, committing changes regularly.
-- [ ] Push commits: git push origin `<firstName-lastName>`.
+- [x] Create a forked copy of this project.
+- [x] Add TL as collaborator on Github.
+- [x] Clone your OWN version of Repo (Not Lambda's by mistake!).
+- [x] Create a new Branch on the clone: git checkout -b `<firstName-lastName>`.
+- [x] Create a pull request before you start working on the project requirements.  You will continuously push your updates throughout the project.
+- [x] You are now ready to build this project with your preferred IDE
+- [x] Implement the project on your Branch, committing changes regularly.
+- [x] Push commits: git push origin `<firstName-lastName>`.
 
 Follow these steps for completing your project:
 
-- [ ] Submit a Pull-Request to merge <firstName-lastName> Branch into master (student's  Repo).
+- [x] Submit a Pull-Request to merge <firstName-lastName> Branch into master (student's  Repo).
 - [ ] Add your team lead as a Reviewer on the Pull-request
 - [ ] TL then will count the HW as done by  merging the branch back into master.
 

challenges/classes.js

@@ -1,7 +1,34 @@
 // 1. Copy and paste your prototype in here and refactor into class syntax.
 
+class CuboidMakerClass {
+    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 cuboidClass = new CuboidMakerClass(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.
+
+class CubeMaker extends CuboidMakerClass {
+	constructor(length, width, height){
+		super(length, width, height)
+	}
+}
+
+const cube = new CuboidMakerClass(1, 1, 1)
 
-// 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());

challenges/functions.js

@@ -7,25 +7,39 @@
   * 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 (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: 
+// Explanation: Nested functions 'inherit' arguments and variables of its containing function. This means that variables only have to be declared once because the inner functon contains the scope of the outer function.
 
 
 const external = "I'm outside the function";

challenges/objects-arrays.js

@@ -7,28 +7,50 @@
 */
 
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
-
+const tyrannosaurus = {
+  diet: "carnivorous",
+  weight: "7000kg",
+  length: "12m",
+  period: "Late Cretaceous"
+};
 // 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();
+tyrannosaurus.roar = function() {
+  return "RAWERSRARARWERSARARARRRR";
+};
+console.log(tyrannosaurus.roar());
 
 
 // ==== Arrays ====
@@ -52,7 +74,10 @@ const graduates = [
 
 Once you have the new array created, sort the universities alphabetically and log the result. */
 const universities = [];
-console.log(universities);
+for (let i = 0; i<graduates.length; i++) {
+  universities.push(graduates[i].university);
+};
+console.log(universities.sort());
 
 /* 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 +86,18 @@ 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++) {
+  contactInfo.push(graduates[i].first_name + " " + graduates[i].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 = [];
+for (let i = 0; i < graduates.length; i++) {
+  if (graduates[i].university.includes ("Uni)")) {
+    unisWithUni.push(graduates[i].university);
+  } 
+}
 console.log(unisWithUni);
 
 
@@ -91,6 +124,9 @@ The zoos want to display both the scientific name and the animal name in front o
 
 */
 const displayNames = [];
+zooAnimals.forEach((index) => {
+  displayNames.push `Name: ${index.animal_name}, Scientific: ${index.scientific_name}`;
+});
 console.log(displayNames);
 
 /* Request 2: .map()
@@ -99,23 +135,35 @@ The zoos need a list of all their animal's names (animal_name only) converted to
 
 */
 
-const lowCaseAnimalNames = [];
+const lowCaseAnimalNames = zooAnimals.map((animals) => {
+  return animals.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((lessThan5) => {
+  return (lessThan5.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.forEach((unitedStates) => {
+  populationTotal.push(unitedStates.population);
+});
+
+const totalPop = zooAnimals.reduce(
+  (accumulator, animal) => accumulator + animal.population,
+  0
+);
 console.log(populationTotal);
 
 

challenges/prototypes.js

@@ -6,28 +6,45 @@
   Create a constructor function named CuboidMaker that accepts properties for length, width, and height
 */
 
+function CuboidMaker(attributes) {
+  this.length = attributes.length;
+  this.width = attributes.width;
+  this.height = attributes.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