You’re in the right place if you want to push your skills to the next level after mastering the basics of JavaScript interview questions. This article dives deep into the questions you can expect in intermediate-level JavaScript interviews.
However, excelling in interviews is not the only aspect. Understanding closures and asynchronous programming is crucial for becoming an effective and confident developer.
1. Asynchronous JavaScript
Imagine you’re building a weather application. You can’t halt the entire app to fetch weather data. Here, asynchronous programming methods like callbacks, promises, and async/await come to your rescue.
Question: What is ‘callback hell’ in the context of using callbacks, and what are its disadvantages?
Answer: “Callback hell” is used when you have many nested callbacks in our code. Think of it as a layer cake of functions where each layer depends on the one above it. This makes our code look like a pyramid, often called the “Pyramid of Doom.” The downside? It makes our code hard to read and even harder to debug. Plus, each new layer adds complexity, making future changes a headache.