👀 Views: 42 💬 Answers: 1 📅 Created: 2025-06-16

javascript arrays filter JavaScript

I'm performance testing and I'm performance testing and I'm relatively new to this, so bear with me. I'm currently working with a JavaScript array of objects, where each object represents a user with nested properties. I want to filter this array based on a condition applied to a nested property, but I'm getting unexpected results. Here's the array I'm working with: ```javascript const users = [ { id: 1, name: 'Alice', details: { age: 25, active: true } }, { id: 2, name: 'Bob', details: { age: 30, active: false } }, { id: 3, name: 'Charlie', details: { age: 35, active: true } }, ]; ``` I am attempting to filter for only the active users like so: ```javascript const activeUsers = users.filter(user => user.details.active); ``` The `activeUsers` array returns the expected results, containing Alice and Charlie. However, when I try to further filter this array to find users over 30 years old, I get an empty array: ```javascript const filteredUsers = activeUsers.filter(user => user.details.age > 30); ``` I expected `filteredUsers` to contain Charlie, but it's coming back as an empty array. I've double-checked the age values and the condition. What’s perplexing is that if I log `activeUsers`, it shows: ```javascript console.log(activeUsers); // Output: [{ id: 1, name: 'Alice', details: { age: 25, active: true } }, { id: 3, name: 'Charlie', details: { age: 35, active: true } }] ``` It seems like the filtering condition should work, but it’s not. Could this be an issue with how the filter function is interpreting the properties, or am I missing something in the logic? I am using Node.js v18.5.0 for this implementation. Any insights would be greatly appreciated! I'm working on a CLI tool that needs to handle this. Any ideas what could be causing this? For reference, this is a production microservice. What's the best practice here?