JavaScript - guide with Array.reduce() While Handling Nested Objects
I've spent hours debugging this and I've searched everywhere and can't find a clear answer. After trying multiple solutions online, I still can't figure this out... I'm working on a project where I need to aggregate a list of user objects stored in a nested array structure. Each user has properties like `id`, `name`, and `posts`, where `posts` is an array of post objects. I'm trying to use `Array.reduce()` to create a summary object that counts the total number of posts per user. However, I'm running into issues where the counts are not being aggregated correctly. Here's the structure of my data: ```javascript const users = [ { id: 1, name: 'Alice', posts: [{ id: 101 }, { id: 102 }] }, { id: 2, name: 'Bob', posts: [{ id: 103 }] }, { id: 3, name: 'Charlie', posts: [] } ]; ``` I tried using the following code to aggregate the post counts: ```javascript const postCounts = users.reduce((acc, user) => { acc[user.name] = (acc[user.name] || 0) + user.posts.length; return acc; }, {}); ``` However, when I log `postCounts`, I get the unexpected result: `{'Alice': 2, 'Bob': 1, 'Charlie': 0}`. This seems correct, but in another part of my app, I need to convert these counts into a sorted array of objects that match the format: `[{ name: 'Alice', postCount: 2 }, ...]`. When I run the following code: ```javascript const sortedPostCounts = Object.entries(postCounts).map(([name, count]) => ({ name, postCount: count })).sort((a, b) => b.postCount - a.postCount); ``` I get an unexpected empty array when the `postCount` is `0` for any user. I suspect that my sorting might not be handling 0 counts properly. Can anyone guide to understand why this is happening and how to ensure that users with zero posts are still included in the final sorted array? I would appreciate any insights or alternative approaches to handle this. I'm using Node.js v14.15.4. Any ideas what could be causing this? For context: I'm using Javascript on Windows. How would you solve this? I'd be grateful for any help.