Struggling with Merging API Response Arrays in Node.js - Duplicates and Order Issues
I'm learning this framework and I'm confused about I'm having trouble with I'm working on a project and hit a roadblock... Currently developing an integration service that fetches user data from two different third-party APIs, but I'm hitting some snags while merging the response arrays. Each API returns an array of user objects, with properties like `id`, `name`, and `email`. The challenge arises when both APIs return users with the same `id` and I want to ensure the merged array contains unique entries while preserving the order of their appearance according to the first API's response. Here’s a simplified version of what I’ve implemented so far: ```javascript const apiOneData = [ { id: 1, name: 'Alice', email: 'alice@example.com' }, { id: 2, name: 'Bob', email: 'bob@example.com' } ]; const apiTwoData = [ { id: 2, name: 'Bob', email: 'bob@another.com' }, { id: 3, name: 'Charlie', email: 'charlie@example.com' } ]; const mergeUserData = (data1, data2) => { const mergedData = [...data1]; // Start with data from the first API data2.forEach(user => { // Check if the user from the second API already exists if (!mergedData.some(existingUser => existingUser.id === user.id)) { mergedData.push(user); } }); return mergedData; }; const result = mergeUserData(apiOneData, apiTwoData); console.log(result); ``` This works as expected for the most part; however, the problem surfaces with users having the same `id` but different details (like the email in Bob's case). I want to consolidate these into a single entry based on the `id`, ideally keeping the information from the first API unless it's missing, in which case I would use the second API's data. Here’s what I’ve tried in addition to the above: - Implementing a `Map` to track IDs and their most recent data, but it feels clunky and I ended up losing the original order. - Using `reduce` to iterate over both arrays, but I struggled with keeping track of which emails to keep without overcomplicating the logic. Could anyone suggest an efficient way to merge these arrays while handling duplicates and maintaining the order? Any insights on design patterns or best practices for this scenario would be greatly appreciated! Also, I'm using Node.js version 14.x and am relying on ES6 features. Looking forward to some creative solutions! My development environment is Ubuntu. What am I doing wrong? I'm coming from a different tech stack and learning Javascript. Thanks for taking the time to read this! Any examples would be super helpful.