chef27615 · chef27615 · Mar 1, 2019 · Mar 1, 2019 · Mar 1, 2019 · Mar 1, 2019
diff --git a/README.md b/README.md
@@ -29,15 +29,38 @@ 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` will looping through the original array.
+
+    - `.map` will make a new array, and it will not disturb the original array.
+
 
 2. What is the difference between a function and a method?
 
+    - a method is a function inside a object
+
+    - function is a stand along entity
+
+
 3. What is closure?
 
+    - a function inside a function, a containment.
+
+
 4. Describe the four rules of the 'this' keyword.
 
+    - window binding
+    - new binding
+    - implicit binding
+    - explicit binding 
+
+
+
 5. Why do we need super() in an extended class?
 
+    - `super() ` will inherit `this` and method from the parent class.
+
+
 ## 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 +1,41 @@
 // 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}`*`${this.width}`;
+    }
+    surfaceArea(){
+        return (`${this.length}`*`${this.width}`+`${this.length}`*`${this.height}`+`${this.width}`*`${this.height}`)*2;
+    }
+  }
+
+
+  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.
+
+class CubeMaker extends CuboidMaker{
+    constructor(prop){
+        super(prop)
+    }
+}
 
-// 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.
+const iceCube = new CubeMaker({
+    length : 5,
+    width: 5,
+    height: 5
+})
+console.log(iceCube.surfaceArea());
+console.log (iceCube.volume());
diff --git a/challenges/functions.js b/challenges/functions.js
@@ -6,19 +6,33 @@
   * The last parameter accepts a callback 
   * In the body of the function return the callback with the two parameters that you created
 */
-
+function consume(para1, para2, cb){
+  return cb(para1, para2);
+}
 
 /* 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 (num1, num2){
+  console.log(num1 + num2) ;
+}
+
+function multiply(num1, num2){
+  console.log(num1 * num2) ;
+}
+
+function greeting(first, last){
+  console.log(`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 ==== 
@@ -28,15 +42,15 @@
 // Explanation: 
 
 
-const external = "I'm outside the function";
+const external = "I'm outside the function"; // this is a global scope varible
 
-function myFunction() {
-  console.log(external);
-  const internal = "Hello! I'm inside myFunction!";
+function myFunction() {                             // this is a outer function    
+  console.log(external);                            // this function can only see what variables are declear inside his scope, and global scope
+  const internal = "Hello! I'm inside myFunction!"; // this function can not see any variable protected by other functions, even the given function was decleared inside of it.
 
-  function nestedFunction() {
-    console.log(internal);
-  };
-  nestedFunction();
+  function nestedFunction() {                       // this is a inner function,
+    console.log(internal);                          // this function can see varibles exist ourside of it's scope
+  };                                                // this is the definition of a closure
+  nestedFunction();                                 // closure behavior was inherited from the lexical enviroment.  
 }
 myFunction();
diff --git a/challenges/index.html b/challenges/index.html
@@ -7,9 +7,9 @@
 
   <title>Sprint Challenge</title>
 
-  <script src="objects-arrays.js"></script>
-  <script src="functions.js"></script>
-  <script src="prototypes.js"></script>
+  <!-- <script src="objects-arrays.js"></script> -->
+  <!-- <script src="functions.js"></script>   -->
+  <!-- <script src="prototypes.js"></script> -->
   <script src="classes.js"></script>
 </head>
 

diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js
@@ -6,29 +6,61 @@
   object name, diet, weight, length, period
 */
 
+
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceious
 
+const tyrannosaurus = {
+  name: 'tyrannosaurus',
+  weight: '700kg',
+  length: '12m',
+  diet: 'carnivorous',
+  period: 'Late Cretaceious',
+  roar: function(){
+    return `RAWERSRARARWERSARARARRRR!`;
+  }
+}
+
 // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic
 
+const stegosaurus = {
+  name: 'stegosaurus',
+  weight: '2000kg',
+  length: '9m',
+  diet: 'herbivorous',
+  period: 'Late Jurassic'
+}
+
+
+
 // velociraptor, carnivorous, 15kg, 1.8m, Late Cretaceious
+const velociraptor = {
+  name: 'velociraptor',
+  weight: '15kg',
+  length: '1.8m',
+  diet: 'carnivorous',
+  period: 'Late Cretaceious'
+}
+
+
+
 
 // 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();
+console.log(tyrannosaurus.roar());
 
 
 // ==== Arrays ====
@@ -50,6 +82,11 @@ 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 = [];
+
+for (let i =0; i< graduates.length; i++){
+  universities.push(graduates[i].university);
+}
+
 console.log(universities)
 
 /* Request 2: Create a new array called contactInfo that contains both first name and email of each student. 
@@ -59,11 +96,23 @@ Name [email protected]
 
 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 uni that contains them all. Log the result. */
 const uni = [];
+
+for (let i =0; i< graduates.length; i++){
+  if(graduates[i].university.includes('Uni')){
+    uni.push(graduates[i].university);
+  }
+}
+
 console.log(uni);
 
 
@@ -89,6 +138,9 @@ The zoo wants to display both the scientific name and the animal name in front o
 
 */
 const animalNames = [];
+
+zooAnimals.forEach(cv=>animalNames.push(cv.animal_name))
+
 console.log(animalNames);
 
 /* Request 2: .map()    
@@ -98,6 +150,9 @@ The zoos need a list of all their animal's names (names only, not scientific) co
 */
 
 const lowerCase = [];
+
+zooAnimals.map(cv => lowerCase.push(cv.scientific_name.toLowerCase()))
+
 console.log(lowerCase); 
 
 /* Request 3: .filter() 
@@ -106,14 +161,21 @@ The zoos are concenred about animals with a lower population count. Find out whi
 
 */
 const largerPopulation = [];
+
+zooAnimals.filter(cv => {
+  if(cv.population<5){
+    return largerPopulation.push(cv);
+  }
+})
+
 console.log(largerPopulation);
 
 /* 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;
+const populationTotal = zooAnimals.reduce((ac, cv) => ac= ac+cv.population, 0)
 console.log(populationTotal);
 
 

diff --git a/challenges/prototypes.js b/challenges/prototypes.js
@@ -5,29 +5,46 @@
 /* == 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.width}`;
+}
 
 /* == 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 (`${this.length}`*`${this.width}`+`${this.length}`*`${this.height}`+`${this.width}`*`${this.height}`)*2;
+}
 
 /* == 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