Great challenge!

src/project-1.js

@@ -2,138 +2,139 @@
 
 const multiplyByTen = (num) => {
   // return num after multiplying it by ten
-  // code here
+  return num * 10;
 };
 
 const subtractFive = (num) => {
   // return num after subtracting five
-  // code here
+  return num - 5;
 };
 
 const areSameLength = (str1, str2) => {
   // return true if the two strings have the same length
   // otherwise return false
-  // code here
+  return str1.length === str2.length;
 };
 
 const areEqual = (x, y) => {
   // return true if x and y are the same
   // otherwise return false
-  // code here
+  return x === y;
 };
 
 const lessThanNinety = (num) => {
   // return true if num is less than ninety
   // otherwise return false
-  // code here
+  return num < 90;
 };
 
 const greaterThanFifty = (num) => {
   // return true if num is greater than fifty
   // otherwise return false
-  // code here
+  return num > 50;
 };
 
 const add = (x, y) => {
   // add x and y together and return the value
-  // code here
+  return x + y;
 };
 
 const subtract = (x, y) => {
   // subtract y from x and return the value
-  // code here
+  return x - y;
 };
 
 const divide = (x, y) => {
   // divide x by y and return the value
-  // code here
+  return x / y;
 };
 
 const multiply = (x, y) => {
   // multiply x by y and return the value
-  // code here
+  return x * y;
 };
 
 const getRemainder = (x, y) => {
   // return the remainder from dividing x by y
-  // code here
+  return x % y;
 };
 
 const isEven = (num) => {
   // return true if num is even
   // otherwise return false
-  // code here
+  return num % 2 === 0;
 };
 
 const isOdd = (num) => {
   // return true if num is odd
   // otherwise return false
-  // code here
+  return num % 2 !== 0;
 };
 
 const square = (num) => {
   // square num and return the new value
-  // code here
+  return num * num;
 };
 
 const cube = (num) => {
   // cube num and return the new value
-  // code here
+  return num * num * num;
 };
 
 const raiseToPower = (num, exponent) => {
   // raise num to whatever power is passed in as exponent
-  // code here
+  return Math.pow(num, exponent);
 };
 
 const roundNumber = (num) => {
   // round num and return it
-  // code here
+  return Math.round(num);
 };
 
 const roundUp = (num) => {
   // round num up and return it
-  // code here
+  return Math.ceil(num);
 };
 
 const addExclamationPoint = (str) => {
   // add an exclamation point to the end of str and return the new string
   // 'hello world' -> 'hello world!'
-  // code here
+  return `${str}!`;
 };
 
 const combineNames = (firstName, lastName) => {
   // return firstName and lastName combined as one string and separated by a space.
   // 'Lambda', 'School' -> 'Lambda School'
   // code here
+  return `${firstName} ${lastName}`;
 };
 
 const getGreeting = (name) => {
   // Take the name string and concatenate other strings onto it so it takes the following form:
   // 'Sam' -> 'Hello Sam!'
-  // code here
+  return `Hello ${name}!`;
 };
 
 // If you can't remember these area formulas then head over to Google or look at the test code.
 
 const getRectangleArea = (length, width) => {
   // return the area of the rectangle by using length and width
-  // code here
+  return length * width;
 };
 
 const getTriangleArea = (base, height) => {
   // return the area of the triangle by using base and height
-  // code here
+  return (height * base) / 2;
 };
 
 const getCircleArea = (radius) => {
   // return the rounded area of the circle given the radius
-  // code here
+  return Math.round(Math.PI * radius * radius);
 };
 
 const getRectangularPrismVolume = (length, width, height) => {
   // return the volume of the 3D rectangular prism given the length, width, and height
-  // code here
+  return length * width * height;
 };
 
 // Do not modify code below this line.

src/project-2.js

@@ -3,6 +3,9 @@
 const getBiggest = (x, y) => {
   // x and y are integers.  Return the larger integer
   // if they are the same return either one
+  if (x > y) return x;
+  if (y > x) return y;
+  return x;
 };
 
 const greeting = (language) => {
@@ -11,15 +14,21 @@ const greeting = (language) => {
   // language: 'Spanish' -> 'Hola!'
   // language: 'Chinese' -> 'Ni Hao!'
   // if language is undefined return 'Hello!'
+  if (language === 'German') return 'Guten Tag!';
+  if (language === 'Spanish') return 'Hola!';
+  if (language === 'Chinese') return 'Ni Hao!';
+  return 'Hello!';
 };
 
 const isTenOrFive = (num) => {
   // return true if num is 10 or 5
   // otherwise return false
+  return num === 10 || num === 5;
 };
 
 const isInRange = (num) => {
   // return true if num is less than 50 and greater than 20
+  return num < 50 && num > 20;
 };
 
 const isInteger = (num) => {
@@ -29,13 +38,19 @@ const isInteger = (num) => {
   // -10 -> true
   // otherwise return false
   // hint: you can solve this using Math.floor
+  if (num > Math.floor(num)) return false;
+  return true;
 };
 
 const fizzBuzz = (num) => {
   // if num is divisible by 3 return 'fizz'
   // if num is divisible by 5 return 'buzz'
   // if num is divisible by 3 & 5 return 'fizzbuzz'
   // otherwise return num
+  if (num % 3 === 0 && num % 5 === 0) return 'fizzbuzz';
+  if (num % 3 === 0) return 'fizz';
+  if (num % 5 === 0) return 'buzz';
+  return num;
 };
 
 const isPrime = (num) => {
@@ -48,58 +63,91 @@ const isPrime = (num) => {
 
 const returnFirst = (arr) => {
   // return the first item from the array
+  return arr[0];
 };
 
 const returnLast = (arr) => {
   // return the last item of the array
+  return arr[arr.length - 1];
 };
 
 const getArrayLength = (arr) => {
   // return the length of the array
+  return arr.length;
 };
 
 const incrementByOne = (arr) => {
   // arr is an array of integers
   // increase each integer by one
   // return the array
+  for (let i = 0; i < arr.length; i++) {
+    arr[i] += 1;
+  }
+  return arr;
 };
 
 const addItemToArray = (arr, item) => {
   // add the item to the end of the array
   // return the array
+  arr.push(item);
+  return arr;
 };
 
 const addItemToFront = (arr, item) => {
   // add the item to the front of the array
   // return the array
   // hint: use the array method .unshift
+  arr.unshift(item);
+  return arr;
 };
 
 const wordsToSentence = (words) => {
   // words is an array of strings
   // return a string that is all of the words concatenated together
   // spaces need to be between each word
   // example: ['Hello', 'world!'] -> 'Hello world!'
+  return words.join(' ');
 };
 
 const contains = (arr, item) => {
   // check to see if item is inside of arr
   // return true if it is, otherwise return false
+  for (let i = 0; i < arr.length; i++) {
+    if (arr[i] === item) return true;
+  }
+  return false;
 };
 
 const addNumbers = (numbers) => {
   // numbers is an array of integers.
   // add all of the integers and return the value
+  let total = 0;
+  for (let i = 0; i < numbers.length; i++) {
+    total += numbers[i];
+  }
+  return total;
 };
 
 const averageTestScore = (testScores) => {
   // testScores is an array.  Iterate over testScores and compute the average.
   // return the average
+  let rawTotal = 0;
+  for (let i = 0; i < testScores.length; i++) {
+    rawTotal += testScores[i];
+  }
+  return rawTotal / testScores.length;
 };
 
 const largestNumber = (numbers) => {
   // numbers is an array of integers
   // return the largest integer
+  let largest = 0;
+  for (let i = 0; i < numbers.length; i++) {
+    if (numbers[i] > largest) {
+      largest = numbers[i];
+    }
+  }
+  return largest;
 };
 
 // Do not modify code below this line.