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Here is a great JavaScript interview question!

What the heck is a Promise doing under the hood?

In JavaScript, things usually happen one after the other. It's like a checklist each item gets done before moving to the next.

When a function returns a Promise, it's like making a promise to do something, like fetch data from the internet. But JavaScript doesn't wait around for the data to come back. Instead, it moves on to the next task.

Now, here's where things get interesting. While JavaScript is busy doing other stuff, like running more code, the Promise is off fetching data in the background.

Once the data is fetched, the Promise is fulfilled, and it has some information to share. But JavaScript needs to know when it's time to handle that information. That's where the onFulfilled part of the Promise comes in.

When the Promise is fulfilled, JavaScript takes the onFulfilled code and puts it in a special queue, ready to be run.

Now, async/await enters the scene. When we mark a function as async, we're telling JavaScript, "Hey, this function might take some time to finish, so don't wait up for it."

And when we use the await keyword inside an async function, it's like saying, "Hold on a sec, JavaScript. I need to wait for something important before moving on."

So, when JavaScript encounters an await keyword, it pauses and lets the async function do its thing. If that thing happens to be a Promise, JavaScript knows it can move on to other tasks while waiting for the Promise to resolve.

Once the Promise is resolved, JavaScript picks up where it left off and continues running the code.

Promises and async/await allow JavaScript to handle asynchronous tasks while keeping things organized and in order. Promises handle the background tasks, while async/await makes it easier to work with them in our code, ensuring everything happens in the right sequence.

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✅ Web Developer Interview Prep Guide (Beginner to Junior Dev) 💻🚀

If you're aiming for your first web dev job, here’s how to prepare:

1️⃣ Understand the Job Role
Companies expect knowledge in:
• Frontend basics (HTML, CSS, JS)
• Git GitHub
• Responsive design
• Basic debugging and testing
• Communication with designers/devs

2️⃣ What Recruiters Look For
✔️ Real projects (GitHub)
✔️ Understanding of fundamentals
✔️ Problem-solving
✔️ Code readability
✔️ Willingness to learn

3️⃣ Core Interview Topics Questions

A. HTML/CSS
• How does the box model work?
• Difference between id and class
• Flexbox vs Grid

B. JavaScript
• What is hoisting?
• Difference between var, let, const
• Explain closures or event bubbling

C. React (if applicable)
• What is a component?
• State vs Props
• What are hooks (useState, useEffect)?

D. Coding Rounds
• Reverse a string
• FizzBuzz
• Find max/min in array
• Remove duplicates

E. Debugging + Tools
• Use browser dev tools
• Console logging
• Understanding basic error messages

4️⃣ Portfolio Tips
✅ Projects to show:
• Responsive website
• To-do app
• Blog or portfolio site
• API-based app (e.g., weather, movie search)
✅ Host on GitHub + Deploy via Netlify/Vercel
✅ Add README to explain project, tech stack, features

5️⃣ Behavioral Questions
• Why do you want to be a web developer?
• Tell me about a project you built.
• How do you handle bugs or challenges?

6️⃣ Bonus Tools to Learn
• Git GitHub
• VS Code shortcuts
• Postman (API testing)
• Figma basics (for UI handoff)

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Here are the top 10 most-asked React interview questions🎯

🌴 How does the virtual DOM work in React?
🌴 What are React Fiber and how does React's reconciliation algorithm work?
🌴 What is the difference between useLayoutEffect and useEffect?
🌴 How do you implement code splitting in a React application?
🌴 What is React.memo, and how does it differ from useMemo?
🌴 How can you optimize performance in a React application?
🌴 What are the different ways to manage state in React (local, global, server state)?
🌴 What is the context API in React, and when would you use it?
🌴 How do you prevent unnecessary re-renders in React components?
🌴 How do you handle SSR hydration issues in React applications?

Take these questions as a starting point and build your core logic through them before moving to more advanced ones. As problem-solving is the number 1 skill interviewers’ test💯

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