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README.md

@@ -24,16 +24,66 @@ Demonstrate your understanding of this week's concepts by answering the followin
 
 Edit this document to include your answers after each question. Make sure to leave a blank line above and below your answer so it is clear and easy to read by your team lead
 
+
+
 1. Briefly compare and contrast `.forEach` & `.map` (2-3 sentences max)
 
+    Both are similar however .map returns a new array with transformed 
+    elements while .forEach returns undefined. Also .map is chainable 
+    while .forEach is not. This means .map can handle other calls like 
+    .sort or .reduce after the .map call. This is something .forEach
+    is not capable of. Also both methods do not mutate the array's 
+    elements on its own without a callback function in use to do so. 
+
+
 2. Explain the difference between a callback and a higher order function.
 
+    A higher order function is the outer scope block within the function 
+    a global scope could call. However a callback function can not be 
+    invoked or called by the global scope. Only the higher order function's
+    scope is capable of accessing the callback function. 
+
 3. What is closure?
+
+    Closure is a scope block a variable or function can be accessable within.
+    Depending on how many nested curly braces there are closure can be increased
+    or decreased. 
 
 4. Describe the four rules of the 'this' keyword.
 
+1.  Simple Function call: Where global functions defaults to the global object and in 
+    strict mode they will default to undefined
+
+2.  Implicit value: The Implicit value points to the object from which it is called 
+    and accounts for the majority of day to day code examples of this. This as an
+    Implicit value is what is to the left of the assignment operator. Which is used 
+    when a constructor's value is referenced. 
+
+
+3. Explicti Value: Used when assigning a specific function or variable a value
+    for Prototypes bind apply or call all use this as a explicit value. In classes 
+    this is similar to passing in values throug the super keyword or when assigning
+    a function to a variable to return an explicitvalue as the bind functions does.  
+
+
+4. new binding: Using the new keyword constructs a new object and this points to it. 
+    So when a function is invoked as a constructor function the this will then point
+    to the new object created to the left of the assignment operator. 
+
+
+
+
+
 5. Why do we need super() in an extended class?
 
+    Super in a extended class will allow the parent class to be accessible from
+    the child class. So all properties a parent class have the child class will
+    as well by just adding in the paramerters need within the parent construtor 
+    through the super function inside of the child class. 
+
+
+
+
 ### Task 1 - Project Set up
 
 Follow these steps to set up and work on your project:

challenges/arrays-callbacks.js

@@ -1,52 +1,125 @@
 // ==== 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.
+// 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()
 
-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."
-
+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."
+Stretch goal
+Convert the regular functions into new es6 arrow functions 
 */
 const displayNames = [];
-console.log(displayNames);
+  let count  = 0;
+  zooAnimals.forEach((e) =>{
+// Add up the object properties
+    displayNames[count]  = `Name: ${e.animal_name} Scientific: ${e.scientific_name}.`;
+    ++count;
+});
 
-/* Request 2: .map()
+console.log('Task1 - Array callbacks');
+displayNames.forEach(e => console.log(e));
 
-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.
+/* 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.
 
 */
+let  lowCaseAnimalNames = [];
+lowCaseAnimalNames =  zooAnimals.map((e)=>{
+// Return the lowercase animals names
+    return  e.animal_name.toLowerCase();
+});
 
-const lowCaseAnimalNames = [];
-console.log(lowCaseAnimalNames);
+
+console.log('Task 2');
+for(let i = 0; i < lowCaseAnimalNames.length; i++){
+// Print the lowercase animal names    
+    console.log(lowCaseAnimalNames[i]);
+}
 
 /* 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.
+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);
+let lowPopulationAnimals = [];
+
+lowPopulationAnimals = zooAnimals.filter(e =>  e.population <= 5);
+
+console.log('Task3');
+for(let i in lowPopulationAnimals){
+// All low population animals 
+    console.log(lowPopulationAnimals[i].animal_name);
+}
 
 /* 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.
+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.
 
 */
 let populationTotal = 0;
-console.log(populationTotal);
+// Array reducer
+const reducer = (accumulator, currentValue) => accumulator + currentValue;
+/*  Array OBject accumulator
+let initialValue = 0
+let sum = [{x: 1}, {x: 2}, {x: 3}].reduce(function (accumulator, currentValue) {
+    return accumulator + currentValue.x
+}, initialValue)
+
+console.log(sum) // logs 6
+*/
+// population array
+let popar = [];
+for(let i = 0; i < zooAnimals.length; i++){
+// Make a population array to use with reducer
+    popar.push(zooAnimals[i].population);
+}
+
+for(let i = 0; i< zooAnimals.length; i++){
+// The population array added up     
+    console.log('Task 4 Total Popualtion: '+popar.reduce(reducer));
+}
+
 
 
 // ==== Callbacks ====  
@@ -55,28 +128,65 @@ console.log(populationTotal);
   * Create a higher-order function named consume with 3 parameters: a, b and cb
   * The first two parameters can take any argument (we can pass any value as argument)
   * The last parameter accepts a callback
-  * The consume function should return the invocation of cb, passing a and b into cb as arguments
+  * The consume function should return the invocation of cb, passing a and b into cb as
+  *  arguments
 */
 
 
 /* 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!"
+  * 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) => {
+
+  return a+b;
+}
+ multiply=(a,b)=>{
 
+  return a*b;
+}
+ greeting=(a,b)=>{
 
+  return `Hello ${a} ${b}, nice to meet you!`;
+}
+
+
+ consume=(a,b,cb)=>{
+
+   return  cb(a,b);
+
+  }
+  //console.log(consume(3,3,cconsume()));
+console.log('Consume callback functions ');
 /* 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!
 
 
 
 
 /*
 
-Stretch: If you haven't already, convert your array method callbacks into arrow functions.
+Stretch: If you haven't already, convert your array method callbacks into arrow 
+functions.
 
 */
 
+
+
+/*
+  Call back function for  buttons clickes
+<button id="callback-btn">Click here</button>
+This time we will see a message on the console only when the user clicks on the button:
+
+document.queryselector("#callback-btn")
+    .addEventListener("click", function() {    
+      console.log("User has clicked on the button!");
+});
+
+*/

challenges/classes.js

@@ -1,7 +1,60 @@
-// 1. Copy and paste your prototype in here and refactor into class syntax.
+// 1. Copy and paste your prototype in here and refactor into 
+//class syntax.
+
+
+class CuboidMaker{
+    constructor(length,width,height){
+        this.length = length;
+        this.height = height;
+        this.width = width;
+    }
+
+    volume = () =>{
+        return this.length * this.width * this.height;
+    }
+
+    surfaceArea = () =>{
+        return 2 * (this.length * this.width + this.length * this.height +
+            this.width * this.height);
+    }
+}
+
+
+console.log('Cklasses ');
+
+let cuboid = new CuboidMaker(5,5,4);
 
 // 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
+
+
+// console.log(c.volume()); // 100
+// console.log(c.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 CuboidMaker{
+    constructor(a,b,c){
+        super(a,b,c);
+        this.cubeMakerValue = 0;
+    }
+    makeAcube = (c,d) =>{
+        this.cubeMakerValue = c * d;
+    }
+    theCube = () =>{
+        return this.cubeMakerValue;
+    }
+}
+let cube  = new CubeMaker(5,5,4);
+console.log('With the strech goal');
+console.log('Volume '+cube.volume()); // 100
+console.log('Surface Area '+cube.surfaceArea()); // 130
+cube.makeAcube(cube.volume(),cube.surfaceArea());
+console.log('The cube with surface area and volume '+ cube.theCube());
+
 
-// 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/closure.js

@@ -1,24 +1,41 @@
 // ==== Closures ==== 
 
-/* Task 1: Study the code below and explain in your own words why nested function can access the variable internal. */
+/* Task 1: Study the code below and explain in your own words why nested 
+function can access the variable internal. */
 
 
 const external = "I'm outside the function";
 
-function myFunction() {
+ myFunction = () => {
   console.log(external);
   const internal = "Hello! I'm inside myFunction!";
 
-  function nestedFunction() {
+   nestedFunction=()=> {
     console.log(internal);
   };
   nestedFunction();
 }
 myFunction();
 
 // Explanation: 
+/*
+  The reason internal is accessbile by nested function is the same type of 
+  reason external is accessible within the myFunction. Its because of scope block
+  The inner nested scope blocks allow these variables closure to those functions. 
+*/
 
 
 /* Task 2: Counter */
 
-/* Create a function called `sumation` that accepts a parameter and uses a counter to return the summation of that number. For example, `summation(4)` should return 10 because 1+2+3+4 is 10. */
+/* Create a function called `sumation` that accepts a parameter and uses
+ a counter to return the summation of that number. For example, 
+ `summation(4)` should return 10 because 1+2+3+4 is 10. */
+const sumation = (p) => {
+  let result = 0;
+  for(let counter = 0; counter <= p; counter++){
+    result = result + counter;
+  }
+  return result;
+};
+console.log('summation '+ sumation(4));
+