diff --git a/package-lock.json b/package-lock.json
index d663c98a..6751df13 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,6 +5,7 @@
   "requires": true,
   "packages": {
     "": {
+      "name": "js-fundamentals",
       "version": "1.0.0",
       "license": "ISC",
       "devDependencies": {
diff --git a/src/conditional-flow/boolean-conditions.js b/src/conditional-flow/boolean-conditions.js
index 70b623d4..194b6d31 100644
--- a/src/conditional-flow/boolean-conditions.js
+++ b/src/conditional-flow/boolean-conditions.js
@@ -4,7 +4,11 @@
 function getResult (didPass) {
 
   // TODO: write code in this function body to pass the tests
-
+ if(didPass){
+  return "Well done, you passed!"
+ }else{
+  return "Sorry, try again"
+ }
 }
 
 module.exports = {
diff --git a/src/conditional-flow/multiple-conditions.js b/src/conditional-flow/multiple-conditions.js
index 80420abf..9368cac8 100644
--- a/src/conditional-flow/multiple-conditions.js
+++ b/src/conditional-flow/multiple-conditions.js
@@ -4,8 +4,8 @@
 function isInRange (num, lower, upper) {
 
   // TODO: write code in this function body to pass the tests
-
-}
+    return num >= lower && num <= upper
+  }
 
 // This function should return true if the passed string is equal
 // to "Hello" or "Goodbye". Implement this with a single
@@ -13,7 +13,10 @@ function isInRange (num, lower, upper) {
 function isHelloOrGoodbye (val1) {
 
   // TODO: write code in this function body to pass the tests
-
+  if(val1 === "Hello" || val1 === "Goodbye"){
+    return true
+  }else{
+    return false}
 }
 
 // This function should return a string that describes the provided age value. The
@@ -31,6 +34,17 @@ function isHelloOrGoodbye (val1) {
 function getAgeDescription (age) {
 
   // TODO: write code in this function body to pass the tests
+  if(age === 0){
+    return "Baby"
+  }else if(age <= 4){
+    return "Toddler"
+  }else if(age <=12){
+    return "Child"
+  }else if(age <=19){
+    return "Teenager"
+  }else{
+    return "Adult"
+  }
 }
 
 module.exports = {
diff --git a/src/conditional-flow/numeric-conditions.js b/src/conditional-flow/numeric-conditions.js
index 0f6656a5..65328c6c 100644
--- a/src/conditional-flow/numeric-conditions.js
+++ b/src/conditional-flow/numeric-conditions.js
@@ -4,21 +4,31 @@
 function isArrayEmpty (array) {
 
   // TODO: write code in this function body to pass the tests
-
+  if(array.length === 0){
+    return true
+  }else{
+    return false
+  }
 }
 
 // This function should return true if num1 is greater than num2, false otherwise
 function isGreaterThan (num1, num2) {
 
   // TODO: write code in this function body to pass the tests
-
+  if(num1 > num2){
+    return true 
+  }else{
+    return false
+  }
 }
 
 // This function should return the lowest number in the passed array
 function findLowest (nums) {
 
   // TODO: write code in this function body to pass the tests
+  smallestNum = Math.min(...nums)
 
+  return smallestNum
 }
 
 module.exports = {
diff --git a/src/conditional-flow/string-conditions.js b/src/conditional-flow/string-conditions.js
index d91bfaf0..a3a8c3a0 100644
--- a/src/conditional-flow/string-conditions.js
+++ b/src/conditional-flow/string-conditions.js
@@ -2,14 +2,22 @@
 function isHello (val1) {
 
   // TODO: write code in this function body to pass the tests
-
+  if(val1 === "Hello"){
+    return true 
+  }else{
+    return false
+  }
 }
 
 // This function should return true if the passed string is not equal to "Hello"
 function isNotHello (val1) {
 
   // TODO: write code in this function body to pass the tests
-
+  if(val1 !== "Hello"){
+    return true
+  }else{
+    return false
+  }
 }
 
 // This function should return true if the string val1 is is longer
@@ -17,7 +25,11 @@ function isNotHello (val1) {
 function isLongerThan (val1, val2) {
 
   // TODO: write code in this function body to pass the tests
-
+  if(val1.length > val2.length){
+    return true
+  }else{
+    return false
+  }
 }
 
 // This function should return true if the string passed in the function's first
@@ -26,8 +38,17 @@ function isLongerThan (val1, val2) {
 function hasOddNumberVowels (val1) {
 
   // TODO: write code in this function body to pass the tests
+    const vowels = ["a", "e", "i", "o", "u"]
+    let countVowels = 0
+    for( let i = 0; i < val1.length; i++){
+      if(vowels.includes(val1[i].toLowerCase())){
+        countVowels++
+      }
+    }
+    return Boolean(countVowels % 2)
+
+  }
 
-}
 
 // this function should return the middle character of a string if it has an odd number
 // of characters. If there are an even number of characters the function should return
@@ -35,7 +56,11 @@ function hasOddNumberVowels (val1) {
 
 function getMiddleLetter (val1) {
   // TODO: write code in this function body to pass the tests
-
+  if (val1.length % 2 === 0) {
+    return val1[val1.length / 2 - 1] + val1[val1.length / 2];
+  } else {
+    return val1[(val1.length + 1) / 2 - 1];
+  }
 }
 
 // This function should return the name of the season for the provided
@@ -50,6 +75,46 @@ function getMiddleLetter (val1) {
 function seasonForMonth (monthName) {
 
   // TODO: write code in this function body to pass the tests
+  let season = "";
+  switch (monthName) {
+    case "March":
+      season = "Spring";
+      break;
+    case "April":
+      season = "Spring";
+      break;
+    case "May":
+      season = "Spring";
+      break;
+    case "June":
+      season = "Summer";
+      break;
+    case "July":
+      season = "Summer";
+      break;
+    case "August":
+      season = "Summer";
+      break;
+    case "September":
+      season = "Autumn";
+      break;
+    case "October":
+      season = "Autumn";
+      break;
+    case "November":
+      season = "Autumn";
+      break;
+    case "December":
+      season = "Winter";
+      break;
+    case "January":
+      season = "Winter";
+      break;
+    case "February":
+      season = "Winter";
+      break;
+  }
+  return season;
 }
 
 module.exports = {
diff --git a/src/data-types/arrays/accessing-elements.js b/src/data-types/arrays/accessing-elements.js
index 374a19bb..b9a1bc24 100644
--- a/src/data-types/arrays/accessing-elements.js
+++ b/src/data-types/arrays/accessing-elements.js
@@ -4,18 +4,18 @@ const cities = ['London', 'Shanghai', 'New York', 'Delhi', 'Kuala Lumpur']
 // TODO: write code to pass the tests
 
 // Set names equal to an array containing 'Bob', 'Jane', 'Joanna' in that order
-const names = null
+const names = ["Bob", "Jane", "Joanna"]
 
 // Set fourthCity to the 4th element in the cities array
-const fourthCity = ''
+const fourthCity = cities[3]
 
 // Set firstCity to the 1st element in the cities array
-const firstCity = ''
+const firstCity = cities[0]
 
 // Set lengthOfCitiesArray to the length of the cities array
-const lengthOfCitiesArray = NaN
+const lengthOfCitiesArray = cities.length
 
-// Do not edit this exported object
+// Do not edit this exported object 
 module.exports = {
   a: names,
   b: fourthCity,
diff --git a/src/data-types/arrays/adding-removing-elements.js b/src/data-types/arrays/adding-removing-elements.js
index 69e559e8..e8f6256b 100644
--- a/src/data-types/arrays/adding-removing-elements.js
+++ b/src/data-types/arrays/adding-removing-elements.js
@@ -10,25 +10,25 @@ const fruits = ['Apple', 'Orange', 'Pear']
 // TODO: write code to pass the tests
 
 // Edit this code to add 'Fred' to the names array
-names.push(undefined)
+names.push("Fred")
 
 // Edit this code to add 4 to the end of the numbers array
-numbers.push(NaN)
+numbers.push(4)
 
 // Edit this code to add 'Rio' to the start of the cities array
-cities.unshift(undefined)
+cities.unshift("Rio")
 
 // Use an array method to remove the first item from colours
-colours
+colours.shift("Red")
 
 // Use an array method to remove the last item from keys
-keys
+keys.pop()
 
 // Use an array method to remove 'Jordon' from the countries array
-countries.splice(NaN, NaN)
+countries.splice(1,1)
 
 // use an array method to remove the last item from the fruits array and store the value in the pear variable
-const pear = fruits.undefined
+const pear = fruits.pop()
 
 // Do not edit this exported object
 module.exports = {
diff --git a/src/data-types/numbers.js b/src/data-types/numbers.js
index 01dd70de..4d1c9579 100644
--- a/src/data-types/numbers.js
+++ b/src/data-types/numbers.js
@@ -6,23 +6,22 @@ const numThree = 32
 // TODO: Add code below using Javascript numeric operators so that the tests pass
 
 // Set this variable to numOne added to numTwo
-const numOnePlusNumTwo = NaN
+const numOnePlusNumTwo = numOne + numTwo
 
 // Set this variable to numThree multiplied by numTwo
-const numThreeTimesNumTwo = NaN
+const numThreeTimesNumTwo = numThree * numTwo
 
 // Set this variable to numThree divided by numOne
-const numThreeDividedByNumOne = NaN
+const numThreeDividedByNumOne = numThree / numOne
 
 // Set this variable to numThree minus numOne
-const numThreeMinusNumOne = NaN
+const numThreeMinusNumOne = numThree - numOne
 
 // Set this variable to the sum of numOne, numTwo and numThree
-const sum = NaN
+const sum = numOne + numTwo + numThree
 
 // Set this variable to the sum of (numOne, numTwo, numThree) divided by numOne
-const numBytes = NaN
-
+const numBytes = (numOne + numTwo + numThree) / numOne 
 // do not edit the exported object.
 module.exports = {
   a: numOnePlusNumTwo,
diff --git a/src/data-types/objects/creating-objects.js b/src/data-types/objects/creating-objects.js
index 1939e6b0..9bb0f303 100644
--- a/src/data-types/objects/creating-objects.js
+++ b/src/data-types/objects/creating-objects.js
@@ -1,7 +1,16 @@
 // TODO: write code in this section to pass the tests. You will need to add new code
 // as well as modify some of the existing code
-const person = null
-const computer = null
+const person = {
+  name: "Jane" ,
+  age: 32,
+}
+const computer = {
+  form: "laptop",
+  specs: {
+    memory : "16GB",
+    storage: "1TB"
+  }
+}
 
 // Do not edit this exported object
 module.exports = {
diff --git a/src/data-types/objects/object-keys.js b/src/data-types/objects/object-keys.js
index 4999e940..ba01ed34 100644
--- a/src/data-types/objects/object-keys.js
+++ b/src/data-types/objects/object-keys.js
@@ -17,10 +17,20 @@ const isbn13 = '978-0132350884'
 // as well as modify some of the existing code
 
 // Set this to the book name
-const name = ''
+const name = book.name
 
 // Set this to the isbn 10 value
-const isbn10 = ''
+const isbn10 = book.isbn.isbn10
+
+book["category"] = "Programming"
+
+book["pages"] = 464;
+
+book.isbn["isbn13"] = '978-0132350884'
+
+delete book.dimensions;
+
+delete book.isbn.asin;
 
 // Do not edit this exported object
 module.exports = {
diff --git a/src/data-types/objects/objects-and-arrays.js b/src/data-types/objects/objects-and-arrays.js
index e4819467..584a5664 100644
--- a/src/data-types/objects/objects-and-arrays.js
+++ b/src/data-types/objects/objects-and-arrays.js
@@ -1,3 +1,5 @@
+const { b } = require("../arrays/adding-removing-elements")
+
 // do not modify this code
 const basket = {
   items: [
@@ -22,10 +24,19 @@ const basket = {
 // as well as modify some of the existing code
 
 // Set this variable to the length of the baskets voucher codes array
-const numberOfVoucherCodes = null
+const numberOfVoucherCodes = basket.voucherCodes.length
 
 // Set this variable to the first element in of the baskets voucher codes array
-const firstVoucherCode = null
+const firstVoucherCode = basket.voucherCodes[0]
+
+ basket.items[0].price = 2
+
+basket.items.push({
+  name: "Oranges",
+  price: 0.75,
+  quantity: 4
+})
+ 
 
 // Do not edit this exported object
 module.exports = {
diff --git a/src/data-types/strings.js b/src/data-types/strings.js
index a8eb8c5b..26ef9a44 100644
--- a/src/data-types/strings.js
+++ b/src/data-types/strings.js
@@ -6,16 +6,16 @@ const secondName = 'Smith'
 // TODO: Update the code using Javascript string operations and the variables above so that the tests pass.
 
 // Set this variable to firstName and secondName concatenated
-const fullName = null
+const fullName = firstName + " " + secondName
 
 // Set this variable to the 10th character of the alphabet variable
-const tenthCharacterOfAlphabet = null
+const tenthCharacterOfAlphabet = alphabet[9]
 
 // Set this variable by calling a method on the alphabet variable to transform it to lower case
-const lowerCaseAlphabet = null
+const lowerCaseAlphabet = alphabet.toLowerCase()
 
 // Set this variable by using a property on the alphabet variable to get it's length
-const numberOfLettersInAlphabet = null
+const numberOfLettersInAlphabet = alphabet.length
 
 // do not edit the exported object.
 module.exports = {
diff --git a/src/functions/calling-functions.js b/src/functions/calling-functions.js
index f44038d6..308776e2 100644
--- a/src/functions/calling-functions.js
+++ b/src/functions/calling-functions.js
@@ -19,13 +19,13 @@ function sayHelloManyTimes (name, times) {
 // TODO: Add and update code here to make the tests pass
 
 // Set this variable to 'Hello' by calling the sayHello function
-const hello = ''
+const hello = sayHello()
 
 // Set this variable variable to 'Hello Jane' calling the sayHelloTo function
-const helloToJane = ''
+const helloToJane = sayHelloTo("Jane")
 
 // Set this variable to 'Hello Bob! Hello Bob! Hello Bob!' calling the sayHelloManyTimes function
-const helloToBob3Times = ''
+const helloToBob3Times = sayHelloManyTimes("Bob", 3)
 
 // do not edit below this line
 module.exports = {
diff --git a/src/functions/creating-functions-multiple-args.js b/src/functions/creating-functions-multiple-args.js
index a437ae8a..dc4535db 100644
--- a/src/functions/creating-functions-multiple-args.js
+++ b/src/functions/creating-functions-multiple-args.js
@@ -9,7 +9,15 @@
 // -1, 1        | [-1, 0, 1]
 //
 // TODO: write code below
+function range (lower,upper){
+  const outputArray = [];
+  
+  for (let i = lower; i <= upper; i++){
+    outputArray.push(i)
+  }
+  return outputArray;
 
+}
 // define a function that takes two arguments: a string and a number.
 // The function should return the same string but in upper case with exclamation
 // marks appended to the end. The number of exclamation marks should be
@@ -21,9 +29,22 @@
 // error, 10    | ERROR!!!!!!!!!!
 //
 // TODO: write code below
-
+function StringAndNumber(string,number){
+let outputmessage = string.toUpperCase()
+//Upper case the string complete
+  let exclamation = ""
+// Implementing the exclamation mark
+  for(let i = 0; i < number; i++){
+    exclamation = exclamation + "!"
+  }
+  //Storing the result into outputmessage
+  outputmessage = outputmessage + exclamation
+ 
+  return outputmessage;
+}
+{}
 // change the exported value to be the name of the function you defined
 module.exports = {
-  a: undefined, // change undefined to be the name of the function defined to create the range of numbers (the first todo)
-  b: undefined // change undefined to be the name of the function defined to return the string with exclamations (the second todo)
+  a: range, // change undefined to be the name of the function defined to create the range of numbers (the first todo)
+  b: StringAndNumber // change undefined to be the name of the function defined to return the string with exclamations (the second todo)
 }
diff --git a/src/functions/creating-functions.js b/src/functions/creating-functions.js
index 2d2ac5e6..187f96bb 100644
--- a/src/functions/creating-functions.js
+++ b/src/functions/creating-functions.js
@@ -7,7 +7,9 @@
 // 2      | 3
 //
 // TODO: write code below
-
+function incrementsNumber(num){
+  return num + 1
+}
 // Define a function that takes any person's name and returns it with a smiley :)!
 // Remember to make the name capitalized!
 //
@@ -18,9 +20,13 @@
 // Aiyana | Hi, Aiyana :)
 //
 // TODO: write code below
+function Smiley(name){
+ 
+  return "Hi, " + name.charAt(0).toUpperCase() + name.slice(1) + " :)"
+}
 
 // TODO: change undefined to be the name of the functions you defined
 module.exports = {
-  a: undefined, // change undefined to be the name of the function you defined to increment a number (the first TODO)
-  b: undefined // change undefined to be the name of the function you defined to say hi (the second TODO)
+  a: incrementsNumber, // change undefined to be the name of the function you defined to increment a number (the first TODO)
+  b: Smiley // change undefined to be the name of the function you defined to say hi (the second TODO)
 }
diff --git a/src/loops/for-loop-and-arrays.js b/src/loops/for-loop-and-arrays.js
index 682995ec..5522adda 100644
--- a/src/loops/for-loop-and-arrays.js
+++ b/src/loops/for-loop-and-arrays.js
@@ -7,18 +7,31 @@ let word = ''
 
 // Use a for loop to set the sum variable to the sum of all the values in nums
 sum = 0
-
+for (let i = 0; i < nums.length; i++){
+  sum = sum + nums[i];
+}
 // Use a for loop to populate doubledNums with every value from nums array doubled (i.e [2, 6, 24, etc...])
 const doubledNums = []
-
+for (let  i = 0; i < nums.length; i++){
+  doubledNums.push(nums[i]*2)
+}
 // Use a for loop to set word equal to all the letters in the letters array
 word = ''
-
+for(let i = 0; i < letters.length; i++){
+  word = word + letters[i];
+}
 // Use a for loop to populate everySecondNum with every second number from the nums array
 const everySecondNum = []
+for (let i = 1; i < nums.length; i+=2){
+  everySecondNum.push(nums[i])
+}
 
 // Use a for loop to populate numsReversed with the numbers from nums in reverse order
 const numsReversed = []
+for (i = nums.length -1; i >= 0; i--){
+  numsReversed.push(nums[i]);
+}
+
 
 // do not change below this line
 module.exports = {
diff --git a/src/loops/for-loop-basic.js b/src/loops/for-loop-basic.js
index 38a5c971..187c1c77 100644
--- a/src/loops/for-loop-basic.js
+++ b/src/loops/for-loop-basic.js
@@ -5,11 +5,24 @@ const countdown = []
 
 // TODO: Write a for loop that adds the numbers 0 to 3 to the numsZeroToThree array
 
+for (let i = 0; i <= 3; i++){
+  numsZeroToThree.push(i)
+}
+
 // TODO: Write a for loop that adds the numbers 5 to 10 to the numsFiveToTen array
 
-// TODO: Write a for loop that adds all the even numbers between 0 and 6 (0, 2, 4, 6) to evenNums
+for (let i = 5; i <= 10; i++){
+  numsFiveToTen.push(i)
+}
 
+// TODO: Write a for loop that adds all the even numbers between 0 and 6 (0, 2, 4, 6) to evenNums
+for (let i = 0; i <= 6; i++){
+  if(i % 2 === 0) evenNums.push(i)
+}
 // TODO: Write a for loop that adds the numbers 3 to 0 (in that order) to the countdown array
+for (let i = 3 ; i >= 0 ; i--){
+  countdown.push(i)
+}
 
 // do not change below this line
 module.exports = {
diff --git a/src/variables/assignment.js b/src/variables/assignment.js
index 98f2e31c..4cd58664 100644
--- a/src/variables/assignment.js
+++ b/src/variables/assignment.js
@@ -4,8 +4,10 @@ firstNumber = 0
 
 // TODO: Set the value of firstNumber below so the tests pass
 
+firstNumber = 20
+
 // TODO: Change the code below so that the tests pass
-const secondNumber = 0 // edit this value
+const secondNumber = 42 // edit this value
 
 // do not edit the exported object.
 module.exports = {
diff --git a/src/variables/declaration.js b/src/variables/declaration.js
index 8afaa55b..c1b4d453 100644
--- a/src/variables/declaration.js
+++ b/src/variables/declaration.js
@@ -2,7 +2,9 @@
 //
 //
 // TODO: Declare the variables firstName and age so that the tests pass
+let firstName = "Jane"
 
+const age = 35
 // do not edit below this line
 let firstNameExport = ''
 try { firstNameExport = firstName } catch (e) {}