Can you share how you have utilized asynchronous JavaScript programming to improve application performance?

How To Approach: Associate

  1. Discuss asynchronous JavaScript in current role.
  2. Enumerate specific projects where async coding was applied.
  3. Describe process and tools used.
  4. Explain the benefits in terms of performance.

Sample Response: Associate

As a Frontend Developer at Mapstar Technologies, I have been routinely using asynchronous JavaScript to enhance user experiences in our applications. A specific project I worked on involved designing a feature to display real-time weather information. The critical challenge in this project was fetching data from multiple weather APIs and processing the large volume of returned data without compromising the application's performance.

To address this challenge, I implemented async/await syntax to manage asynchronous code execution. We used the axios library to fetch weather data concurrently from multiple sources and compiled it on the user's dashboard. The async/await syntax allowed us to control the flow of code and seamlessly handle the returned Promises, achieving non-blocking code execution and, consequently, an efficiently running application despite its complex data retrieval processes.