What are the key differences between synchronous and asynchronous JavaScript?

Key Differences Between Synchronous and Asynchronous JavaScript

When it comes to JavaScript programming, understanding the differences between synchronous and asynchronous execution is crucial. The focus keyword "synchronous and asynchronous JavaScript" pertains to how code is processed and executed in the browser. Here are the key distinctions:

• Synchronous JavaScript: In synchronous execution, code is executed sequentially, one instruction at a time. This means that each task must wait for the previous one to complete before moving on to the next task. This can lead to blocking the main thread and causing delays in page responsiveness.
• Asynchronous JavaScript: Asynchronous execution allows tasks to be executed independently, without waiting for other tasks to complete. This can be achieved using callback functions, Promises, or async/await syntax. Asynchronous code helps improve performance by allowing other tasks to be processed while waiting for certain operations to complete.

Overall, understanding when to use synchronous and asynchronous JavaScript is crucial for creating responsive and efficient web applications.