Yes, JavaScript is single-threaded.
🔹 What That Means:
- It executes one operation at a time in a single call stack.
- JavaScript uses the event loop and callback queue to handle asynchronous tasks like timers, DOM events, and API calls without blocking the main thread.
✅ Key Points:
- Only one statement is processed at a time.
- Prevents race conditions but can cause blocking if heavy computations run on the main thread.
- Asynchronous tasks (like
setTimeout,fetch) are handled by the browser/Web APIs, not in the main thread directly.
🔁 Example:
console.log("Start");
setTimeout(() => {
console.log("Async Task");
}, 0);
console.log("End");
Output:
Start
End
Async Task
📝 In Summary:
JavaScript is single-threaded, meaning it processes code in a single sequence, but with the help of asynchronous callbacks and the event loop, it can handle multiple operations efficiently without blocking.
