Finished some more problems

kait-schorr · kait-schorr · commit fae45afb18f1 · 2018-02-16T14:43:11.000-06:00
diff --git a/src/project-2.js b/src/project-2.js
@@ -89,7 +89,7 @@ const returnFirst = (arr) => {
 
 const returnLast = (arr) => {
   // return the last item of the array
-  return arr[-1];
+  return arr[arr.length - 1];
 };
 
 const getArrayLength = (arr) => {
@@ -101,44 +101,57 @@ 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
+  return arr.includes(item);
 };
 
 const addNumbers = (numbers) => {
   // numbers is an array of integers.
   // add all of the integers and return the value
+  return numbers.reduce((x, y) => x + y);
 };
 
 const averageTestScore = (testScores) => {
   // testScores is an array.  Iterate over testScores and compute the average.
   // return the average
+  return testScores.reduce((x, y) => x + y) / testScores.length;
 };
 
 const largestNumber = (numbers) => {
   // numbers is an array of integers
   // return the largest integer
+  return numbers.reduce((x, y) => (y > x) ? y : x);
 };
 
 // Do not modify code below this line.
