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/spec/variables/assignment.spec.js b/spec/variables/assignment.spec.js
index 265ae766..ec9f59e7 100644
--- a/spec/variables/assignment.spec.js
+++ b/spec/variables/assignment.spec.js
@@ -1,11 +1,11 @@
-const { a, b } = require('../../src/variables/assignment.js')
+const { a, b } = require("../../src/variables/assignment.js");
 
 describe("Variable Assignment:", () => {
   it("firstNumber is 20", () => {
-    expect(a).toEqual(20)
-  })
+    expect(a).toEqual(20);
+  });
 
   it("secondNumber is 42", () => {
-    expect(b).toEqual(42)
-  })
-})
+    expect(b).toEqual(42);
+  });
+});
diff --git a/src/conditional-flow/boolean-conditions.js b/src/conditional-flow/boolean-conditions.js
index 70b623d4..19cc8fe8 100644
--- a/src/conditional-flow/boolean-conditions.js
+++ b/src/conditional-flow/boolean-conditions.js
@@ -1,12 +1,16 @@
 // This function should accept a boolean value and return the string
 // "Well done, you passed!" if the value is true, or "Sorry, try again"
 // if the value is false.
-function getResult (didPass) {
-
+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 = {
-  a: getResult
-}
+  a: getResult,
+};
diff --git a/src/conditional-flow/multiple-conditions.js b/src/conditional-flow/multiple-conditions.js
index 80420abf..d5093088 100644
--- a/src/conditional-flow/multiple-conditions.js
+++ b/src/conditional-flow/multiple-conditions.js
@@ -1,19 +1,23 @@
 // This function should return true if num is greater
 // than or equal to lower AND less than or equal to upper.
 // Implement this with a single condition.
-function isInRange (num, lower, upper) {
-
+function isInRange(num, lower, upper) {
   // TODO: write code in this function body to pass the tests
 
+  if (num >= lower && num <= upper) {
+    return true;
+  } else return false;
 }
 
 // This function should return true if the passed string is equal
 // to "Hello" or "Goodbye". Implement this with a single
 // if statement.
-function isHelloOrGoodbye (val1) {
-
+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
@@ -28,13 +32,18 @@ function isHelloOrGoodbye (val1) {
 // 5-12   | Child
 // 13-19  | Teenager
 // 20+    | Adult
-function getAgeDescription (age) {
-
+function getAgeDescription(age) {
   // TODO: write code in this function body to pass the tests
+
+  if (0 === age) return "Baby";
+  if (0 < age && age <= 4) return "Toddler";
+  if (4 < age && age <= 12) return "Child";
+  if (13 <= age && age <= 19) return "Teenager";
+  if (20 <= age) return "Adult";
 }
 
 module.exports = {
   a: isInRange,
   b: isHelloOrGoodbye,
-  c: getAgeDescription
-}
+  c: getAgeDescription,
+};
diff --git a/src/conditional-flow/numeric-conditions.js b/src/conditional-flow/numeric-conditions.js
index 0f6656a5..52718479 100644
--- a/src/conditional-flow/numeric-conditions.js
+++ b/src/conditional-flow/numeric-conditions.js
@@ -1,28 +1,33 @@
 // TODO: Implement the functions below to make the tests pass
 
 // This function should return true if there are no elements in the array, false otherwise
-function isArrayEmpty (array) {
-
+function isArrayEmpty(array) {
   // TODO: write code in this function body to pass the tests
 
+  if (array.length === 0) return true;
+
+  return false;
 }
 
 // This function should return true if num1 is greater than num2, false otherwise
-function isGreaterThan (num1, num2) {
-
+function isGreaterThan(num1, num2) {
   // TODO: write code in this function body to pass the tests
+  if (num1 > num2) return true;
 
+  return false;
 }
 
 // This function should return the lowest number in the passed array
-function findLowest (nums) {
-
+function findLowest(nums) {
   // TODO: write code in this function body to pass the tests
 
+  let lowest = Math.min(...nums);
+
+  return lowest;
 }
 
 module.exports = {
   a: isArrayEmpty,
   b: isGreaterThan,
-  c: findLowest
-}
+  c: findLowest,
+};
diff --git a/src/conditional-flow/string-conditions.js b/src/conditional-flow/string-conditions.js
index d91bfaf0..91a5cb96 100644
--- a/src/conditional-flow/string-conditions.js
+++ b/src/conditional-flow/string-conditions.js
@@ -1,41 +1,56 @@
 // This function should return true if the passed string is equal to "Hello"
-function isHello (val1) {
+function isHello(val1) {
+  if (val1 === "Hello") return true;
+  return false;
 
   // 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) {
-
+function isNotHello(val1) {
   // TODO: write code in this function body to pass the tests
-
+  if (val1 !== "Hello") return true;
+  return false;
 }
 
 // This function should return true if the string val1 is is longer
 // than string val2
-function isLongerThan (val1, val2) {
-
+function isLongerThan(val1, val2) {
   // TODO: write code in this function body to pass the tests
-
+  if (val1.length > val2.length) return true;
+  return false;
 }
 
 // This function should return true if the string passed in the function's first
 // argument has an odd number of vowels
 
-function hasOddNumberVowels (val1) {
-
+function hasOddNumberVowels(val1) {
   // TODO: write code in this function body to pass the tests
+  let vowel_list = "aeiouAEIOU";
+  let vcount = 0;
+
+  for (let x = 0; x < val1.length; x++) {
+    if (vowel_list.indexOf(val1[x]) !== -1) {
+      vcount += 1;
+    }
+  }
 
+  if (vcount % 2 !== 0) return true;
+  return false;
 }
 
 // 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
 // the middle two letters
 
-function getMiddleLetter (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[Math.floor(val1.length / 2)];
+  }
 }
 
 // This function should return the name of the season for the provided
@@ -47,9 +62,49 @@ function getMiddleLetter (val1) {
 // Summer - June to August
 // Autumn - September to November
 // Winter - December to February
-function seasonForMonth (monthName) {
-
+function seasonForMonth(monthName) {
   // TODO: write code in this function body to pass the tests
+
+  switch (monthName) {
+    case (monthName = "January"):
+      return "Winter";
+      break;
+    case (monthName = "February"):
+      return "Winter";
+      break;
+    case (monthName = "December"):
+      return "Winter";
+      break;
+    case (monthName = "March"):
+      return "Spring";
+      break;
+    case (monthName = "April"):
+      return "Spring";
+      break;
+    case (monthName = "May"):
+      return "Spring";
+      break;
+    case (monthName = "June"):
+      return "Summer";
+      break;
+    case (monthName = "July"):
+      return "Summer";
+      break;
+    case (monthName = "August"):
+      return "Summer";
+      break;
+    case (monthName = "September"):
+      return "Autumn";
+      break;
+    case (monthName = "October"):
+      return "Autumn";
+      break;
+    case (monthName = "November"):
+      return "Autumn";
+      break;
+    default:
+      return "";
+  }
 }
 
 module.exports = {
@@ -58,5 +113,5 @@ module.exports = {
   c: isLongerThan,
   d: hasOddNumberVowels,
   e: getMiddleLetter,
-  f: seasonForMonth
-}
+  f: seasonForMonth,
+};
diff --git a/src/data-types/arrays/accessing-elements.js b/src/data-types/arrays/accessing-elements.js
index 374a19bb..3afd78b6 100644
--- a/src/data-types/arrays/accessing-elements.js
+++ b/src/data-types/arrays/accessing-elements.js
@@ -1,24 +1,24 @@
 // do not edit this section
-const cities = ['London', 'Shanghai', 'New York', 'Delhi', 'Kuala Lumpur']
+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 = {
   a: names,
   b: fourthCity,
   c: firstCity,
-  d: lengthOfCitiesArray
-}
+  d: lengthOfCitiesArray,
+};
diff --git a/src/data-types/arrays/adding-removing-elements.js b/src/data-types/arrays/adding-removing-elements.js
index 69e559e8..f0bfdbcf 100644
--- a/src/data-types/arrays/adding-removing-elements.js
+++ b/src/data-types/arrays/adding-removing-elements.js
@@ -1,34 +1,34 @@
 // do not edit this section
-const cities = ['London', 'Shanghai', 'New York', 'Delhi', 'Kuala Lumpur']
-const names = []
-const numbers = [1, 2, 3]
-const colours = ['Red', 'Blue', 'Yellow']
-const keys = ['q', 'w', 'e', 'r', 't', 'y']
-const countries = ['Bolivia', 'Jordan', 'Greenland']
-const fruits = ['Apple', 'Orange', 'Pear']
+const cities = ["London", "Shanghai", "New York", "Delhi", "Kuala Lumpur"];
+const names = [];
+const numbers = [1, 2, 3];
+const colours = ["Red", "Blue", "Yellow"];
+const keys = ["q", "w", "e", "r", "t", "y"];
+const countries = ["Bolivia", "Jordan", "Greenland"];
+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 = {
@@ -39,5 +39,5 @@ module.exports = {
   e: keys,
   f: countries,
   g: fruits,
-  h: pear
-}
+  h: pear,
+};
diff --git a/src/data-types/numbers.js b/src/data-types/numbers.js
index 01dd70de..be261689 100644
--- a/src/data-types/numbers.js
+++ b/src/data-types/numbers.js
@@ -1,27 +1,27 @@
 // do not edit these lines
-const numOne = 8
-const numTwo = 16
-const numThree = 32
+const numOne = 8;
+const numTwo = 16;
+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 = {
@@ -30,5 +30,5 @@ module.exports = {
   c: numThreeDividedByNumOne,
   d: numThreeMinusNumOne,
   e: sum,
-  f: numBytes
-}
+  f: numBytes,
+};
diff --git a/src/data-types/objects/creating-objects.js b/src/data-types/objects/creating-objects.js
index 1939e6b0..b01812c1 100644
--- a/src/data-types/objects/creating-objects.js
+++ b/src/data-types/objects/creating-objects.js
@@ -1,10 +1,19 @@
 // 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 = {
   person: person,
-  computer: computer
-}
+  computer: computer,
+};
diff --git a/src/data-types/objects/object-keys.js b/src/data-types/objects/object-keys.js
index 4999e940..beae37ec 100644
--- a/src/data-types/objects/object-keys.js
+++ b/src/data-types/objects/object-keys.js
@@ -1,30 +1,38 @@
 // do not edit this section
 const book = {
-  name: 'Clean Code',
-  author: 'Robert C. Martin',
-  category: 'Cooking',
+  name: "Clean Code",
+  author: "Robert C. Martin",
+  category: "Cooking",
   isbn: {
-    isbn10: '9780132350884',
-    asin: '0132350882'
+    isbn10: "9780132350884",
+    asin: "0132350882",
   },
-  publisher: 'Prentice Hall',
-  dimensions: '10x12x2'
-}
+  publisher: "Prentice Hall",
+  dimensions: "10x12x2",
+};
 
-const isbn13 = '978-0132350884'
+const isbn13 = "978-0132350884";
 
 // 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
 
+book.category = "Programming";
+book.pages = 464;
+book.isbn.isbn13 = isbn13;
+delete book.dimensions;
+delete book.isbn.asin;
+
+console.log(book);
+
 // 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;
 
 // Do not edit this exported object
 module.exports = {
   name: name,
   isbn10: isbn10,
-  book: book
-}
+  book: book,
+};
diff --git a/src/data-types/objects/objects-and-arrays.js b/src/data-types/objects/objects-and-arrays.js
index e4819467..1729e08f 100644
--- a/src/data-types/objects/objects-and-arrays.js
+++ b/src/data-types/objects/objects-and-arrays.js
@@ -2,34 +2,38 @@
 const basket = {
   items: [
     {
-      name: 'Apple',
+      name: "Apple",
       quantity: 10,
-      price: 1
+      price: 1,
     },
     {
-      name: 'Lemon',
+      name: "Lemon",
       quantity: 2,
-      price: 0.5
-    }
+      price: 0.5,
+    },
   ],
-  voucherCodes: [
-    'AA-AA-A',
-    'BB-BB-B'
-  ]
-}
+  voucherCodes: ["AA-AA-A", "BB-BB-B"],
+};
 
 // 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
 
+basket.items[0].price = 2;
+basket.items.push({
+  name: "Oranges",
+  price: 0.75,
+  quantity: 4,
+});
+
 // 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];
 
 // Do not edit this exported object
 module.exports = {
   basket: basket,
   numberOfVoucherCodes: numberOfVoucherCodes,
-  firstVoucherCode: firstVoucherCode
-}
+  firstVoucherCode: firstVoucherCode,
+};
diff --git a/src/data-types/strings.js b/src/data-types/strings.js
index a8eb8c5b..5690d3ee 100644
--- a/src/data-types/strings.js
+++ b/src/data-types/strings.js
@@ -1,26 +1,26 @@
 // do not edit these lines
-const alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
-const firstName = 'Jane'
-const secondName = 'Smith'
+const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+const firstName = "Jane";
+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 = {
   a: fullName,
   b: tenthCharacterOfAlphabet,
   c: lowerCaseAlphabet,
-  d: numberOfLettersInAlphabet
-}
+  d: numberOfLettersInAlphabet,
+};
diff --git a/src/functions/calling-functions.js b/src/functions/calling-functions.js
index f44038d6..566ea27b 100644
--- a/src/functions/calling-functions.js
+++ b/src/functions/calling-functions.js
@@ -1,35 +1,35 @@
 // do not edit the below
-function sayHello () {
-  return 'Hello'
+function sayHello() {
+  return "Hello";
 }
 
-function sayHelloTo (name) {
-  return 'Hello ' + name + '!'
+function sayHelloTo(name) {
+  return "Hello " + name + "!";
 }
 
-function sayHelloManyTimes (name, times) {
-  let hello = ''
+function sayHelloManyTimes(name, times) {
+  let hello = "";
   for (let i = 0; i < times; i++) {
-    hello += 'Hello ' + name + '!'
+    hello += "Hello " + name + "!";
   }
 
-  return hello
+  return hello;
 }
 
 // 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 = {
   a: hello,
   b: helloToJane,
-  c: helloToBob3Times
-}
+  c: helloToBob3Times,
+};
diff --git a/src/functions/creating-functions-multiple-args.js b/src/functions/creating-functions-multiple-args.js
index a437ae8a..1412cb16 100644
--- a/src/functions/creating-functions-multiple-args.js
+++ b/src/functions/creating-functions-multiple-args.js
@@ -10,6 +10,16 @@
 //
 // TODO: write code below
 
+function lowerToUpper(lower, upper) {
+  const numbersArr = [];
+
+  for (let i = lower; i <= upper; i++) {
+    numbersArr.push(i);
+  }
+
+  return numbersArr;
+}
+
 // 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
@@ -22,8 +32,18 @@
 //
 // TODO: write code below
 
+function numberToExclamation(string, number) {
+  let stringUpper = string.toUpperCase();
+
+  for (let i = 0; i < number; i++) {
+    stringUpper += "!";
+  }
+
+  return stringUpper;
+}
+
 // 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: lowerToUpper, // change undefined to be the name of the function defined to create the range of numbers (the first todo)
+  b: numberToExclamation, // 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..51e8517c 100644
--- a/src/functions/creating-functions.js
+++ b/src/functions/creating-functions.js
@@ -8,6 +8,10 @@
 //
 // TODO: write code below
 
+function incrementByOne(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!
 //
@@ -19,8 +23,13 @@
 //
 // TODO: write code below
 
+function returnWithSmile(name) {
+  let capFirst = name[0].toUpperCase() + name.slice(1);
+  return "Hi, " + capFirst + " :)";
+}
+
 // 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: incrementByOne, // change undefined to be the name of the function you defined to increment a number (the first TODO)
+  b: returnWithSmile, // 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..c2bcc777 100644
--- a/src/loops/for-loop-and-arrays.js
+++ b/src/loops/for-loop-and-arrays.js
@@ -1,24 +1,48 @@
-const nums = [1, 3, 12, 5, 1, 6, 4, 1, 10]
-const letters = ['H', 'e', 'l', 'l', 'o']
-let sum = 0
-let word = ''
+const nums = [1, 3, 12, 5, 1, 6, 4, 1, 10];
+const letters = ["H", "e", "l", "l", "o"];
+let sum = 0;
+let word = "";
 
 // TODO: Add code below this line to make the tests pass
 
 // Use a for loop to set the sum variable to the sum of all the values in nums
-sum = 0
+sum = 0;
+
+for (let i = 0; i < nums.length; i++) {
+  const value = nums[i];
+  sum += value;
+}
 
 // Use a for loop to populate doubledNums with every value from nums array doubled (i.e [2, 6, 24, etc...])
-const doubledNums = []
+const doubledNums = [];
+
+for (let i = 0; i < nums.length; i++) {
+  const doubleUp = nums[i] * 2;
+  doubledNums.push(doubleUp);
+}
 
 // Use a for loop to set word equal to all the letters in the letters array
-word = ''
+word = "";
+
+for (let i = 0; i < letters.length; i++) {
+  word += letters[i];
+}
 
 // Use a for loop to populate everySecondNum with every second number from the nums array
-const everySecondNum = []
+const everySecondNum = [];
+
+for (let i = 0; i < nums.length; i++) {
+  if (i % 2 === 1) {
+    everySecondNum.push(nums[i]);
+  }
+}
 
 // Use a for loop to populate numsReversed with the numbers from nums in reverse order
-const numsReversed = []
+const numsReversed = [];
+
+for (let i = nums.length - 1; i >= 0; i--) {
+  numsReversed.push(nums[i]);
+}
 
 // do not change below this line
 module.exports = {
@@ -26,5 +50,5 @@ module.exports = {
   b: doubledNums,
   c: word,
   d: everySecondNum,
-  e: numsReversed
-}
+  e: numsReversed,
+};
diff --git a/src/loops/for-loop-basic.js b/src/loops/for-loop-basic.js
index 38a5c971..4826ddad 100644
--- a/src/loops/for-loop-basic.js
+++ b/src/loops/for-loop-basic.js
@@ -1,20 +1,35 @@
-const numsZeroToThree = []
-const numsFiveToTen = []
-const evenNums = []
-const countdown = []
+const numsZeroToThree = [];
+const numsFiveToTen = [];
+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++) {
+  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 = {
   a: numsZeroToThree,
   b: numsFiveToTen,
   c: evenNums,
-  d: countdown
-}
+  d: countdown,
+};
diff --git a/src/variables/assignment.js b/src/variables/assignment.js
index 98f2e31c..ac6fdb1f 100644
--- a/src/variables/assignment.js
+++ b/src/variables/assignment.js
@@ -1,14 +1,14 @@
 // do not edit this
-let firstNumber = 10
-firstNumber = 0
-
+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 = {
   a: firstNumber,
-  b: secondNumber
-}
+  b: secondNumber,
+};
diff --git a/src/variables/declaration.js b/src/variables/declaration.js
index 8afaa55b..816bb8ce 100644
--- a/src/variables/declaration.js
+++ b/src/variables/declaration.js
@@ -3,14 +3,21 @@
 //
 // TODO: Declare the variables firstName and age so that the tests pass
 
+let firstName = "Jane";
+let age = 35;
+
 // do not edit below this line
-let firstNameExport = ''
-try { firstNameExport = firstName } catch (e) {}
+let firstNameExport = "";
+try {
+  firstNameExport = firstName;
+} catch (e) {}
 
-let ageExport = 0
-try { ageExport = age } catch (e) {}
+let ageExport = 0;
+try {
+  ageExport = age;
+} catch (e) {}
 
 module.exports = {
   firstName: firstNameExport,
-  age: ageExport
-}
+  age: ageExport,
+};