19 synchronous vs asynchronous behaviour in javascript

synchronous and asynchronous behavior in javascript are fundamental concepts that define how tasks are executed within the language. synchronous operations are executed sequentially, meaning one task must complete before the next begins. this can lead to blocking, where the program becomes unresponsive if a long-running task is performed. in contrast, asynchronous operations allow tasks to be initiated and then proceed without waiting for them to complete. this is achieved through mechanisms like callbacks, promises, and async/await, enabling the program to continue executing other code while waiting for the asynchronous task to finish. asynchronous behavior is crucial for performing tasks like network requests or file operations, where waiting would hinder user experience. understanding the distinction between synchronous and asynchronous behavior is essential for writing efficient, non-blocking code in javascript, leading to better performance and responsiveness in web applications.
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