diff --git a/challenges/.vscode/launch.json b/challenges/.vscode/launch.json
new file mode 100644
index 0000000000..5594169e78
--- /dev/null
+++ b/challenges/.vscode/launch.json
@@ -0,0 +1,17 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Launch Program",
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "program": "${workspaceFolder}\\functions.js"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/challenges/classes.js b/challenges/classes.js
index 992e39dc0b..f6c92866a9 100644
--- a/challenges/classes.js
+++ b/challenges/classes.js
@@ -1,7 +1,19 @@
 // 1. Copy and paste your prototype in here and refactor into class syntax.
-
+class CuboidMaker {
+  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); 
+  }
+}
 // 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.
\ No newline at end of file
+// 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
index 6e3688bfcc..85f30fb46c 100644
--- a/challenges/functions.js
+++ b/challenges/functions.js
@@ -6,26 +6,52 @@
   * 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(firstVal, secondVal, CallBackVal){
+    return CallBackVal(firstVal,secondVal);
+}
+//console.log(consume('Robel','Mengistu'))
 /* 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 gender(sVal){
+//     if (sVal === "f" || sVal === "F") {
+//       return "Femal";
+//     } else if (sVal === "m" || sVal === "M") {
+//       return "Male";
+//     } else {
+//       return " Not a Gender";
+//     }
+// }
+
+//ADD
+function add(valOne, valTwo){
+  return valOne + valTwo;
+}
+
+//MULTIPLY
+function multiply(valOne, valTwo){
+  return valOne * valTwo;
+}
+
+//GREETINGS
+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!
+ 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: 
+// Explanation: the inner funciton is able to access it due to rule of closure,since internal variable is outside of the nestedfunction curly braces it can see it,
 
 
 const external = "I'm outside the function";
diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js
index 86970b0c29..396362d45b 100644
--- a/challenges/objects-arrays.js
+++ b/challenges/objects-arrays.js
@@ -7,28 +7,56 @@
 */
 
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
+const tyrannosaurus = {
+  name:'tyrannosaurus',
+  diet:'carnivorous',
+  weight:'7000kg',
+  length:'12m',
+  period:'Late Cretaceous',
+  roar = function(){
+    return 'RAWERSRARARWERSARARARRRR!';
+  }
+  
+
+}
 
 // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic
+const stegosaurus = {
+  name:'stegosaurus',
+  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 Cretaceous'
+
+}
 
 // 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 ====
@@ -49,9 +77,11 @@ const graduates = [
 ];
 
 /* Request 1: Create a new array called universities that contains all the universities in the graduates array. This will be an array of strings.
-
 Once you have the new array created, log the result. */
 const universities = [];
+for (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. This will be an array of strings.
@@ -61,11 +91,23 @@ The resulting contact information strings should have a space between the first
 
 Log the result of your new array. */
 const contactInfo = [];
+for (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 unisWithUni that contains them all. This will be an array of objects. Log the result. */
 const unisWithUni = [];
-console.log(unisWithUni);
+let searchVal='Uni';
+// const testRun = graduates.find()
+// const result = graduates.find(({ university }) => university === "Uni");
+//make sure to change searchVal if testing with direct console 
+for(i=0; i< graduates.length; i++){
+  if(graduates[i].university.includes(searchVal) == true){
+    unisWithUni.push(graduates[i].university);
+  }
+}
+  console.log(unisWithUni);
 
 
 // ==== ADVANCED Array Methods ====
@@ -91,7 +133,11 @@ The zoos want to display both the scientific name and the animal name in front o
 
 */
 const displayNames = [];
-console.log(displayNames);
+zooAnimals.forEach(function(zooAnimals){
+  displayNames.push(`${zooAnimals.scientific_name} ${zooAnimals.animal_name}`)
+})
+console.log(displayNames)
+
 
 /* Request 2: .map()
 
@@ -99,7 +145,9 @@ The zoos need a list of all their animal's names (animal_name only) converted to
 
 */
 
-const lowCaseAnimalNames = [];
+let lowCaseAnimalNames = zooAnimals.map((eachAnimal,index,zooAnimals)=>{
+  return eachAnimal.animal_name.toLowerCase();
+});
 console.log(lowCaseAnimalNames);
 
 /* Request 3: .filter() 
@@ -115,8 +163,11 @@ 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;
-console.log(populationTotal);
+let totalPopulation = zooAnimals.reduce((population, eachAnimal,indexedDB,zooAnimals)=>{
+  // return population = population + eachAnimal.population;
+     return population +=eachAnimal.population;
+ },0)//initial value issues
+ console.log(totalPopulation);
 
 
 /*
diff --git a/challenges/package-lock.json b/challenges/package-lock.json
new file mode 100644
index 0000000000..48e341a095
--- /dev/null
+++ b/challenges/package-lock.json
@@ -0,0 +1,3 @@
+{
+  "lockfileVersion": 1
+}
diff --git a/challenges/prototypes.js b/challenges/prototypes.js
index 4cafc33e95..056a7f392b 100644
--- a/challenges/prototypes.js
+++ b/challenges/prototypes.js
@@ -4,7 +4,13 @@
 
 /* == Step 1: Base Constructor ==
   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 ==
@@ -12,6 +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 ==
@@ -19,15 +28,26 @@
 
   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 cubidObj = 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(cubidObj.volume()); // 100
+console.log(cubidObj.surfaceArea()); // 130