Suffyan-T · Suffyan-T · Jul 26, 2019 · Jul 26, 2019 · Jul 26, 2019 · Jul 26, 2019
diff --git a/README.md b/README.md
@@ -29,15 +29,36 @@ 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 project manager
 
 1. Describe the biggest difference between `.forEach` & `.map`.
+
+	.forEach uses the provided function to mutate the provided array while .map creates a new array using the provided function.
+
 
 2. What is the difference between a function and a method?
 
+	A function is group of reusable code declared outside an object while a method is declared inside an object.
+
 3. What is closure?
 
+	 A closure is the combination of a function and the lexical environment within which that function was declared. This environment consists of any local variables that were in-scope at the time the closure was created
+
 4. Describe the four rules of the 'this' keyword.
 
+	1. Global/Window Object Binding:
+        When the this is called without anything left of the dot it is in the global object.
+
+	2.  Implicit Binding:
+        when you call a function/method inside an object whatever comes before the dot is the this object.
+
+	3. New binding:
+        when using a Constructor the object that is created by the constructor is the this object
+
+	4. Explicit binding:
+        You can use .call, .apply or .bind to tell this what object it is applied to.
+
 5. Why do we need super() in an extended class?
 
+	super() binds the this to the parent 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 +1,20 @@
 // 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 cuboidFourFiveFive = 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(cuboidFourFiveFive.volume()); // 100
+console.log(cuboidFourFiveFive.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.
diff --git a/challenges/functions.js b/challenges/functions.js
@@ -6,26 +6,32 @@
   * The last parameter accepts a callback 
   * In the body of the function return the callback with the two parameters that you created
 */
-
+let consume = (arg1,arg2,cb)=>{return cb(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 greeting that accepts a first and last name and returns "Hello first-name last-name, nice to meet you!"
 */
+let add = (arg1, arg2)=>{return arg1+arg2;}
+
+let multiply = (arg1, arg2)=>{return arg1*arg2;}
 
+let 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!
+consume(2,2,add); // 4
+consume(10,16,multiply); // 160
+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: 
+//nested Function can acess internal becasue it is declared in its parent scope.
+//Functions have acess to variables and methods decalred in all scopes parent to it all up the way to window/global scope.
 
 
 const external = "I'm outside the function";

diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js
@@ -7,29 +7,47 @@
 */
 
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
-
+const tyrannosaurus = {
+  'name': 'Tyrannosaurus',
+  'diet': 'carnivorous',
+  'weight': '7000kg',
+  'length': '12m',
+  'period': 'Late Cretacious',
+}
 // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic
-
+const stegosaurus = {
+  'name': 'Tstegosaurus',
+  '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 Cretacious'
+}
 // Using your dinosaur objects, log answers to these questions:
 
 // How much did tyrannosaurus weigh?
-console.log();
+console.log(tyrannosaurus.weight); //7000kg
 
 // What was the diet of a velociraptor?
-console.log();
+console.log(velociraptor.diet);  //carnivorous
 
 // How long was a stegosaurus?
-console.log();
+console.log(stegosaurus.length); //9m
 
 // What time period did tyrannosaurus live in?
-console.log();
+console.log(tyrannosaurus.period); //Late Cretacious
 
 
 // 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());  //RAWERSRARARWERSARARARRRR!
 
 // ==== Arrays ====
 
@@ -50,7 +68,9 @@ const graduates = [{"id":1,"first_name":"Cynde","university":"Missouri Southern
 
 Once you have the new array created, sort the universities alphabetically and log the result. */
 const universities = [];
-console.log(universities)
+    graduates.forEach(element=>{universities.push(element.university);});
+    universities.sort();
+    console.log(universities);
 
 /* Request 2: Create a new array called contactInfo that contains both first name and email of each student. 
 
@@ -59,11 +79,13 @@ Name [email protected]
 
 Log the result of your new array. */
 const contactInfo = [];
+    graduates.forEach(element=>{contactInfo.push(`${element.first_name} ${element.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 = [];
+let uni = [];
+    uni = graduates.filter(elem => elem.university.includes("Uni"));
 console.log(uni);
 
 
@@ -89,6 +111,7 @@ The zoo wants to display both the scientific name and the animal name in front o
 
 */
 const animalNames = [];
+      zooAnimals.forEach(elem=>{animalNames.push(`"Name: ${elem.animal_name}, Scientific: ${elem.scientific_name}."`);});
 console.log(animalNames);
 
 /* Request 2: .map()    
@@ -98,22 +121,24 @@ The zoos need a list of all their animal's names (names only, not scientific) co
 */
 
 const lowerCase = [];
-console.log(lowerCase); 
+      zooAnimals.forEach(elem=>{lowerCase.push(elem.animal_name.toLowerCase());});
+console.log(lowerCase);
 
 /* Request 3: .filter() 
 
 The zoos are concenred about animals with a lower population count. Find out which animals have a population less than 5.
 
 */
-const lowerPopulation = [];
+const lowerPopulation = zooAnimals.filter(elem => elem.population < 5);
 console.log(lowerPopulation);
 
 /* 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;
+let populationTotal = 0;
+      populationTotal = zooAnimals.reduce((accumulator, currentValue) => accumulator + currentValue.population, 0);
 console.log(populationTotal);
 
 

diff --git a/challenges/prototypes.js b/challenges/prototypes.js
@@ -5,29 +5,42 @@
 /* == 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 cuboidFourFiveFive = 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(cuboidFourFiveFive.volume()); // 100
+console.log(cuboidFourFiveFive.surfaceArea()); // 130
+