completed exercise 4.7

parts/4/blogApp/src/utils.js

@@ -52,7 +52,6 @@ const mostPosts = (posts) => {
     return acc;
   }, {});
 
-  // Use Object.entries to find the top author
   const [author, postsCount] = Object.entries(countMap).reduce(
     (max, entry) => (entry[1] > max[1] ? entry : max),
     ['', 0]
@@ -61,6 +60,24 @@ const mostPosts = (posts) => {
   return { author, posts: postsCount };
 };
 
+const mostLikes = (posts) => {
+    if (!posts || posts.length === 0) {
+      return null;
+    }
+  
+    const likesMap = posts.reduce((acc, post) => {
+      acc[post.author] = (acc[post.author] || 0) + post.likes;
+      return acc;
+    }, {});
+  
+    const [author, likesCount] = Object.entries(likesMap).reduce(
+      (max, entry) => (entry[1] > max[1] ? entry : max),
+      ['', 0]
+    );
+  
+    return { author, likes: likesCount };
+  };
+
 module.exports = {
   reverse,
   average,
@@ -68,4 +85,5 @@ module.exports = {
   totalLikes,
   favoritePost,
   mostPosts,
+  mostLikes
 };