diff --git a/README.md b/README.md
index cc6d6902fb..5bfbbd6c08 100644
--- a/README.md
+++ b/README.md
@@ -26,14 +26,28 @@ Edit this document to include your answers after each question. Make sure to lea
1. Briefly compare and contrast `.forEach` & `.map` (2-3 sentences max)
+A: .forEach is sort of like a for loop in that it iterates through every item in an array and does something to the original array whereas .map leave the original array alone while creating a new array with something done to the data from the original array before returning it.
+
2. Explain the difference between a callback and a higher order function.
+A: A callback is a function which is passed into a higher order function as a parameter whereas a higher order function is a function which takes a callback as a parameter.
+
3. What is closure?
+A: A synonym for hell on earth...JK, JK...but for reals!!! Closure is the ability to put two or more functions together and gives the ability to access functions that are in a child level scope from a parent level scope even after the parent level function has been terminated. Yeah, try to say that ten times fast without smiling :)
+
4. Describe the four rules of the 'this' keyword.
+A: So depending on the use of the "this" keyword, it will be used in different ways, called binding, which refers to what "this" binds to.
+ a) In global binding, the value of this is the window or console unit. It's like everything.
+ b) In implicit binding, the object to the left of the dot gets the "this.
+ c) In new binding, when a constructor function is used, this refers to the specific instance of the object created by the constructor function.
+ d) In explicit binding, whenever call, apply, or bind methods are used, this is explicity defined within the method.
+
5. Why do we need super() in an extended class?
+A: Super is used to get data to be used in a child from a parent object.
+
### Task 1 - Project Set up
Follow these steps to set up and work on your project:
diff --git a/challenges/arrays-callbacks.js b/challenges/arrays-callbacks.js
index 472ab3e96d..78a4cfe5d8 100644
--- a/challenges/arrays-callbacks.js
+++ b/challenges/arrays-callbacks.js
@@ -21,6 +21,14 @@ The zoos want to display both the scientific name and the animal name in front o
*/
const displayNames = [];
+
+zooAnimals.forEach(function(currentValue){
+ displayNames.push(
+ `Name: ${currentValue.animal_name},
+ Scientific: ${currentValue.scientific_name}.`
+ );
+});
+
console.log(displayNames);
/* Request 2: .map()
@@ -30,6 +38,12 @@ The zoos need a list of all their animal's names (animal_name only) converted to
*/
const lowCaseAnimalNames = [];
+
+zooAnimals.map(function(currentValue){
+ lowCaseAnimalNames.push(
+ currentValue.animal_name.toLowerCase());
+});
+
console.log(lowCaseAnimalNames);
/* Request 3: .filter()
@@ -37,7 +51,12 @@ console.log(lowCaseAnimalNames);
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(
+ function(currentValue){
+ return currentValue.population < 5;
+ }
+);
+
console.log(lowPopulationAnimals);
/* Request 4: .reduce()
@@ -45,7 +64,11 @@ console.log(lowPopulationAnimals);
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.reduce(
+ function(callBackPopReduce, data){
+ return callBackPopReduce + data.population;
+ }, 0);
+
console.log(populationTotal);
@@ -58,6 +81,9 @@ console.log(populationTotal);
* 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
@@ -65,18 +91,55 @@ console.log(populationTotal);
* 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;
+}
-/* 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!
-
+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!
/*
Stretch: If you haven't already, convert your array method callbacks into arrow functions.
*/
-
+const displayNames2 = [];
+
+zooAnimals.forEach(currentValue => {
+ displayNames2.push(
+ `Name: ${currentValue.animal_name},
+ Scientific: ${currentValue.scientific_name}.`
+ );
+});
+
+const lowCaseAnimalNames2 = [];
+
+zooAnimals.map(currentValue => {
+ lowCaseAnimalNames2.push(
+ currentValue.animal_name.toLowerCase());
+});
+
+const lowPopulationAnimals2 = zooAnimals.filter(
+ currentValue => {
+ return currentValue.population < 5;
+});
+
+const populationTotal2 = zooAnimals.reduce(
+ (callBackPopReduce, data) => {
+ return callBackPopReduce + data.population;
+}, 0);
+
+console.log(displayNames2);
+console.log(lowCaseAnimalNames2);
+console.log(lowPopulationAnimals2);
+console.log(populationTotal2);
\ No newline at end of file
diff --git a/challenges/classes.js b/challenges/classes.js
index 992e39dc0b..14172bd034 100644
--- a/challenges/classes.js
+++ b/challenges/classes.js
@@ -1,7 +1,61 @@
// 1. Copy and paste your prototype in here and refactor into class syntax.
+class CuboidMaker2 {
+ constructor(attributes){
+ this.length = attributes.length;
+ this.width = attributes.width;
+ this.height = attributes.height;
+ }
+ volume (){
+ return this.length * this.width * this.height;
+ }
+ surfaceArea(){
+ return (
+ 2 *
+ (this.length * this.width +
+ this.length * this.height +
+ this.width * this.height)
+ );
+ }
+}
+
+ let cuboid2 = new CuboidMaker2({
+ 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(cuboid2.volume()); // 100
+console.log(cuboid2.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(attributes){
+ super(attributes);
+ }
+ CubeVolume(){
+ return (
+ this.length *
+ this. width *
+ this.height
+ );
+ }
+ CubeSurfaceArea(){
+ return 2 * (
+ this.length * this.length +
+ this.width * this.width +
+ this.height * this.height
+ );
+ }
+}
+
+let cube = new CubeMaker ({
+ length: 5,
+ width: 5,
+ height: 5,
+});
-// 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.
\ No newline at end of file
+console.log(cube.CubeVolume()); // 125
+console.log(cube.CubeSurfaceArea()); // 150
\ No newline at end of file
diff --git a/challenges/closure.js b/challenges/closure.js
index 101d68e553..b20182a779 100644
--- a/challenges/closure.js
+++ b/challenges/closure.js
@@ -18,7 +18,18 @@ myFunction();
// Explanation:
+`A: nestedFunction can access the variable internal because they are both within the block level scope of myFunction.`
/* 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. */
+
+function summation(n){
+ let counter = 0;
+ for (let i=1; i<= n; i++){
+ counter += i;
+ }
+ return counter;
+}
+
+console.log(summation(4));
\ No newline at end of file
diff --git a/challenges/index.html b/challenges/index.html
index 5772804b7f..0dc5ec27dd 100644
--- a/challenges/index.html
+++ b/challenges/index.html
@@ -7,8 +7,8 @@
Sprint Challenge
-
-
+
+
diff --git a/challenges/prototypes.js b/challenges/prototypes.js
index 4cafc33e95..e5bbb0534a 100644
--- a/challenges/prototypes.js
+++ b/challenges/prototypes.js
@@ -6,6 +6,11 @@
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
@@ -13,6 +18,9 @@
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.
@@ -20,14 +28,27 @@
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.
*/
-// Test your volume and surfaceArea methods by uncommenting the logs below:
-// console.log(cuboid.volume()); // 100
-// console.log(cuboid.surfaceArea()); // 130
-
+let 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
\ No newline at end of file