implementing Removing Duplicates from a Nested Array in JavaScript - advanced patterns
I'm trying to implement I've searched everywhere and can't find a clear answer... I tried several approaches but none seem to work... I'm working on a project using JavaScript ES6, where I have a nested array of objects, and I need to remove duplicates based on a specific property. The array looks like this: ```javascript const data = [ { id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }, { id: 1, name: 'Alice' }, { id: 3, name: 'Charlie' }, { id: 2, name: 'Bob' } ]; ``` I tried using the `filter` method along with `map` to accomplish this, but I'm not getting the expected result. Here’s what I have: ```javascript const uniqueData = data.filter((value, index, self) => index === self.findIndex((t) => (t.id === value.id)) ); ``` After running this code, I expected to see an array with unique objects, but instead, I noticed that the original array is returned without modifications. To debug, I logged the intermediate values, and it seems the `findIndex` method is returning the expected indices, but the condition is not filtering out duplicates as anticipated. I also tried using a `Set` to manage the unique ids, but faced issues when trying to maintain the original object structure: ```javascript const uniqueSet = new Set(); const uniqueArray = data.filter(item => { const duplicate = uniqueSet.has(item.id); uniqueSet.add(item.id); return !duplicate; }); ``` This approach works fine for removing duplicates, but it doesn't maintain the original order of appearance when the same `id` appears multiple times in succession. I want to ensure that the first occurrence is preserved while also keeping the original order intact. I'm using Node.js version 14 and would appreciate any suggestions or best practices to achieve this functionality effectively. Any insights would help! This is part of a larger web app I'm building. What's the best practice here? For context: I'm using Javascript on macOS. Is there a better approach? Has anyone dealt with something similar?