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..d57b96a8 100644
--- a/src/conditional-flow/boolean-conditions.js
+++ b/src/conditional-flow/boolean-conditions.js
@@ -2,7 +2,7 @@
 // "Well done, you passed!" if the value is true, or "Sorry, try again"
 // if the value is false.
 function getResult (didPass) {
-
+return didPass === true ? 'Well done, you passed!' : 'Sorry, try again'
   // TODO: write code in this function body to pass the tests
 
 }
diff --git a/src/conditional-flow/multiple-conditions.js b/src/conditional-flow/multiple-conditions.js
index 80420abf..d7833d69 100644
--- a/src/conditional-flow/multiple-conditions.js
+++ b/src/conditional-flow/multiple-conditions.js
@@ -2,7 +2,7 @@
 // than or equal to lower AND less than or equal to upper.
 // Implement this with a single condition.
 function isInRange (num, lower, upper) {
-
+return (lower<=num&&num<=upper);            
   // TODO: write code in this function body to pass the tests
 
 }
@@ -11,7 +11,11 @@ function isInRange (num, lower, upper) {
 // to "Hello" or "Goodbye". Implement this with a single
 // if statement.
 function isHelloOrGoodbye (val1) {
-
+if (val1 === "Hello" || val1 === "Goodbye") {
+  return true;
+} else { 
+  return false
+}
   // TODO: write code in this function body to pass the tests
 
 }
@@ -29,7 +33,17 @@ function isHelloOrGoodbye (val1) {
 // 13-19  | Teenager
 // 20+    | Adult
 function getAgeDescription (age) {
-
+if (age === 0) {
+  return "Baby" 
+  } else if (1<=age&&age<=4){
+    return "Toddler"
+  } else if (5<=age&&age<=12){
+    return "Child"
+  } else if (13<=age&&age<=19){
+    return "Teenager"
+  } else if (age>=20){
+    return "Adult"
+  }
   // TODO: write code in this function body to pass the tests
 }
 
diff --git a/src/conditional-flow/numeric-conditions.js b/src/conditional-flow/numeric-conditions.js
index 0f6656a5..fc57cd5d 100644
--- a/src/conditional-flow/numeric-conditions.js
+++ b/src/conditional-flow/numeric-conditions.js
@@ -2,21 +2,26 @@
 
 // This function should return true if there are no elements in the array, false otherwise
 function isArrayEmpty (array) {
-
+      return array.length === 0 ? true : false;
   // TODO: write code in this function body to pass the tests
 
 }
 
 // This function should return true if num1 is greater than num2, false otherwise
 function isGreaterThan (num1, num2) {
-
+      return num1 > num2 == true;
   // TODO: write code in this function body to pass the tests
 
 }
 
 // This function should return the lowest number in the passed array
 function findLowest (nums) {
-
+  let lowest = nums[0];
+  for (i=1;i<=nums.length;i++){
+    if (nums[i] < lowest) {
+      lowest = nums[i]
+    }
+  } return lowest      
   // TODO: write code in this function body to pass the tests
 
 }
diff --git a/src/conditional-flow/string-conditions.js b/src/conditional-flow/string-conditions.js
index d91bfaf0..66a47507 100644
--- a/src/conditional-flow/string-conditions.js
+++ b/src/conditional-flow/string-conditions.js
@@ -1,13 +1,13 @@
 // This function should return true if the passed string is equal to "Hello"
 function isHello (val1) {
-
+  return val1 === "Hello"
   // TODO: write code in this function body to pass the tests
 
 }
 
 // This function should return true if the passed string is not equal to "Hello"
 function isNotHello (val1) {
-
+  return !isHello(val1)
   // TODO: write code in this function body to pass the tests
 
 }
@@ -15,16 +15,24 @@ function isNotHello (val1) {
 // This function should return true if the string val1 is is longer
 // than string val2
 function isLongerThan (val1, val2) {
-
+  return val1.length>val2.length
   // TODO: write code in this function body to pass the tests
 
 }
 
 // This function should return true if the string passed in the function's first
 // argument has an odd number of vowels
-
 function hasOddNumberVowels (val1) {
-
+  let vowelCount=0;
+    for (i=0; i<val1.length; i++) {
+      if (val1.charAt(i).toLowerCase() === 'a'||
+          val1.charAt(i).toLowerCase() === 'e'||
+          val1.charAt(i).toLowerCase() === 'o'||
+          val1.charAt(i).toLowerCase() === 'i'||
+          val1.charAt(i).toLowerCase() === 'u'){
+          vowelCount++
+    }}
+    return vowelCount%2 === 1;
   // TODO: write code in this function body to pass the tests
 
 }
@@ -34,8 +42,11 @@ function hasOddNumberVowels (val1) {
 // the middle two letters
 
 function getMiddleLetter (val1) {
+  let sliceValue = val1.length/2;
   // TODO: write code in this function body to pass the tests
-
+return (val1.length%2===1) ?
+  val1.slice(sliceValue,sliceValue+1) :
+  val1.slice(sliceValue-1,sliceValue+1)
 }
 
 // This function should return the name of the season for the provided
@@ -48,7 +59,15 @@ function getMiddleLetter (val1) {
 // Autumn - September to November
 // Winter - December to February
 function seasonForMonth (monthName) {
-
+if (monthName==="March"||monthName==="April"||monthName==="May"){
+  return "Spring"
+} else if (monthName==="June"||monthName==="July"||monthName==="August"){
+  return "Summer"
+} else if (monthName==="September"||monthName==="October"||monthName==="November"){
+  return "Autumn"
+} else if (monthName==="December"||monthName==="January"||monthName==="February"){
+  return "Winter"
+} else return ""
   // TODO: write code in this function body to pass the tests
 }
 
diff --git a/src/data-types/arrays/accessing-elements.js b/src/data-types/arrays/accessing-elements.js
index 374a19bb..bfa479e8 100644
--- a/src/data-types/arrays/accessing-elements.js
+++ b/src/data-types/arrays/accessing-elements.js
@@ -4,16 +4,16 @@ 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
 module.exports = {
diff --git a/src/data-types/arrays/adding-removing-elements.js b/src/data-types/arrays/adding-removing-elements.js
index 69e559e8..80fa3d2e 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()
 
 // 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..05e38ab1 100644
--- a/src/data-types/numbers.js
+++ b/src/data-types/numbers.js
@@ -6,22 +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 = numOnePlusNumTwo + numThree
 
 // Set this variable to the sum of (numOne, numTwo, numThree) divided by numOne
-const numBytes = NaN
+const numBytes = sum/numOne
 
 // do not edit the exported object.
 module.exports = {
diff --git a/src/data-types/objects/creating-objects.js b/src/data-types/objects/creating-objects.js
index 1939e6b0..994e7c99 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..0286c92f 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..42fd254b 100644
--- a/src/data-types/objects/objects-and-arrays.js
+++ b/src/data-types/objects/objects-and-arrays.js
@@ -21,11 +21,21 @@ const basket = {
 // 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
 
+
+
 // 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',
+  quantity: 4,
+  price: 0.75
+})
 
 // Do not edit this exported object
 module.exports = {
diff --git a/src/data-types/strings.js b/src/data-types/strings.js
index a8eb8c5b..793d49fa 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.charAt(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/demo/demo.js b/src/demo/demo.js
index 9201bd8a..3b9e9dae 100644
--- a/src/demo/demo.js
+++ b/src/demo/demo.js
@@ -4,11 +4,11 @@ const numTwo = 2
 let numThree = 0
 
 // TODO: Update numThree so the tests pass
-numThree = 0
+numThree = 5
 
 // TODO: Update the code below so that the tests pass
 
-const numOnePlusNumTwo = 0 // Set this variable to numOne plus numTwo
+const numOnePlusNumTwo = numOne+numTwo // Set this variable to numOne plus numTwo
 
 // do not edit this section
 module.exports = {
diff --git a/src/functions/calling-functions.js b/src/functions/calling-functions.js
index f44038d6..4cc96add 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..bc6be6e6 100644
--- a/src/functions/creating-functions-multiple-args.js
+++ b/src/functions/creating-functions-multiple-args.js
@@ -9,7 +9,13 @@
 // -1, 1        | [-1, 0, 1]
 //
 // TODO: write code below
-
+const createRangeArray = (lower,upper) => {
+  let rangeArray = [];
+  for (let i=upper;i>=lower;i--){
+     rangeArray.unshift(i);
+  }
+  return rangeArray;
+}
 // 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 +27,18 @@
 // error, 10    | ERROR!!!!!!!!!!
 //
 // TODO: write code below
+const makeCapsAndAddExclamation = (str,num) => {
+  let capsString = str.toUpperCase();
+  let exclamationString = '';
+  let createString = num => {
+    for (let i=1;i<=num;i++){
+      exclamationString = exclamationString+'!';
+    }   return exclamationString;
+    }; return capsString+createString(num);
+  }
 
 // 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: createRangeArray, // change undefined to be the name of the function defined to create the range of numbers (the first todo)
+  b: makeCapsAndAddExclamation // 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..3e3bcd78 100644
--- a/src/functions/creating-functions.js
+++ b/src/functions/creating-functions.js
@@ -7,7 +7,9 @@
 // 2      | 3
 //
 // TODO: write code below
-
+const addOne = 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 +20,14 @@
 // Aiyana | Hi, Aiyana :)
 //
 // TODO: write code below
-
+const smileyGreeting = str => {
+  let firstLetter = str => {
+    return str.slice(0,1).toUpperCase()
+  }
+  return `Hi, ${firstLetter(str) + str.substring(1,str.length)} :)`
+  }
 // 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: addOne, // change undefined to be the name of the function you defined to increment a number (the first TODO)
+  b: smileyGreeting // 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..9ddf2b0e 100644
--- a/src/loops/for-loop-and-arrays.js
+++ b/src/loops/for-loop-and-arrays.js
@@ -7,19 +7,29 @@ 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(2*nums[i]);
+}
 // 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=i+2){
+  everySecondNum.push(nums[i]);
+}
 // Use a for loop to populate numsReversed with the numbers from nums in reverse order
 const numsReversed = []
-
+for (let i=0;i<nums.length;i++){
+  numsReversed.unshift(nums[i]);
+}
 // do not change below this line
 module.exports = {
   a: sum,
diff --git a/src/loops/for-loop-basic.js b/src/loops/for-loop-basic.js
index 38a5c971..dac7a5ce 100644
--- a/src/loops/for-loop-basic.js
+++ b/src/loops/for-loop-basic.js
@@ -4,17 +4,25 @@ const evenNums = []
 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
-
+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=i+2){
+  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=0;i<=3;i++){
+  countdown.unshift(i);
+}
 // do not change below this line
 module.exports = {
   a: numsZeroToThree,
   b: numsFiveToTen,
   c: evenNums,
   d: countdown
-}
+}
\ No newline at end of file
diff --git a/src/variables/assignment.js b/src/variables/assignment.js
index 98f2e31c..6762c400 100644
--- a/src/variables/assignment.js
+++ b/src/variables/assignment.js
@@ -1,11 +1,12 @@
+//DONE
 // do not edit this
 let firstNumber = 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..de828146 100644
--- a/src/variables/declaration.js
+++ b/src/variables/declaration.js
@@ -1,8 +1,9 @@
-//
+//DONE
 //
 //
 // TODO: Declare the variables firstName and age so that the tests pass
-
+const firstName = "Jane"
+const age = 35
 // do not edit below this line
 let firstNameExport = ''
 try { firstNameExport = firstName } catch (e) {}