Completed Self-Study Questions. Starting work now.

README.md

@@ -30,14 +30,30 @@ Edit this document to include your answers after each question. Make sure to lea
 
 1. Describe the biggest difference between `.forEach` & `.map`.
 
+.foreach has an action for each element in an array where as map creates a new array to take action on.
+
 2. What is the difference between a function and a method?
 
+Methods are associated with objects and only is passed the object its with.
+
 3. What is closure?
 
+A closed enviorment of code in whic things may come in but never leave.
+
 4. Describe the four rules of the 'this' keyword.
 
+Global Binding: Defaults to refer to othe window.
+
+Impliscit Binding: Only applies to objects with methods.
+
+New Binding: Uses constructive functions to create new things
+
+Exsplicit Binding: Overrides other bindings by using .call and .apply etc
+
 5. Why do we need super() in an extended class?
 
+It will not function without it.
+
 ## Project Set up
 
 Follow these steps to set up and work on your project:

challenges/classes.js

@@ -1,7 +1,24 @@
 // 1. Copy and paste your prototype in here and refactor into class syntax.
+class CuboidMaker{
+    constructor(attr){
+    this.length = attr.length;
+    this.width = attr.width;
+    this.height = attr.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({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
 
 // 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

@@ -6,27 +6,37 @@
   * The last parameter accepts a callback
   * 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(first_name, last_name){
+  return `Hello ${first_name} ${last_name}, 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 can access it becuase it has the right to inherient its parents assets */
 
 const external = "I'm outside the function";
 

challenges/objects-arrays.js

@@ -7,28 +7,30 @@
 */
 
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
-
+const dinosaur1 = {name: 'tyrannosaurus', diet: 'carnivorous', weight: '7000kg', length: '12m', period: 'Late Cretaceous'}
 // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic
-
+const dinosaur2 = {name: 'stegosaurus',diet: 'herbivorous',weight: '2000kg',length: '9m',period: 'Late Jurassic'}
 // velociraptor, carnivorous, 15kg, 1.8m, Late Cretaceous
-
+const dinosaur3 = {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(dinosaur1.weight);
 
 // What was the diet of a velociraptor?
-console.log();
+//console.log(dinosaur2.diet);
 
 // How long was a stegosaurus?
-console.log();
+//console.log(dinosaur3.length);
 
 // What time period did tyrannosaurus live in?
-console.log();
+//console.log(dinosaur1.period);
 
 
 // Create a new roar method for the tyrannosaurus.  When called, return "RAWERSRARARWERSARARARRRR!" Log the result.
-console.log();
+dinosaur1.roar = "RAWERSRARARWERSARARARRRR!";
+//console.log(dinosaur1.roar);
+
 
 
 // ==== Arrays ====
@@ -52,7 +54,13 @@ const graduates = [
 
 Once you have the new array created, log the result. */
 const universities = [];
-console.log(universities);
+function getUniversities(){
+  for(let i = 0; i < graduates.length; i++){
+    universities.push(graduates[i].university);
+  }
+}
+getUniversities()
+//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.
 
@@ -61,7 +69,13 @@ The resulting contact information strings should have a space between the first
 
 Log the result of your new array. */
 const contactInfo = [];
-console.log(contactInfo);
+function getContactInfo(){
+  for(let i = 0; i < graduates.length; i++){
+    contactInfo.push(`${graduates[i].first_name} ${graduates[i].email}`);
+  }
+}
+getContactInfo()
+//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 = [];
@@ -88,35 +102,41 @@ const zooAnimals = [
 /* Request 1: .forEach()
 
 The zoos want to display both the scientific name and the animal name in front of the habitats. Populate the displayNames array with only the animal_name and scientific_name of each animal. displayNames will be an array of strings, and each string should follow this pattern: "Name: Jackal, asiatic, Scientific: Canis aureus."
-
+Name: Jackal, asiatic, Scientific: Canis aureus.
 */
 const displayNames = [];
-console.log(displayNames);
+zooAnimals.forEach(element => {
+  displayNames.push(`Name: ${element.animal_name}, Sientific: ${element.scientific_name}`)
+});
+//console.log(displayNames);
 
 /* Request 2: .map()
 
 The zoos need a list of all their animal's names (animal_name only) converted to lower case. Using map, create a new array of strings named lowCaseAnimalNames, each string following this pattern: "jackal, asiatic". Log the resut.
 
 */
 
-const lowCaseAnimalNames = [];
-console.log(lowCaseAnimalNames);
+const lowCaseAnimalNames = zooAnimals.map(name => name.animal_name);
+//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 = [];
-console.log(lowPopulationAnimals);
+
+const lowPopulationAnimals = zooAnimals.filter(function (pop){return pop.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;
-console.log(populationTotal);
+const populationTotal = zooAnimals.reduce((total, pop) => {
+  return total += pop.population;
+}, 0);
+//console.log(populationTotal);
 
 
 /*

challenges/prototypes.js

@@ -5,29 +5,39 @@
 /* == Step 1: Base Constructor ==
   Create a constructor function named CuboidMaker that accepts properties for length, width, and height
 */
-
+function CuboidMaker(attr){
+  this.length = attr.length;
+  this.width = attr.width;
+  this.height = attr.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