Understanding the Event Loop
How the Event Loop Works
1. Call Stack: The Event Loop starts with the call stack, a data structure that keeps track of the currently executing function. When a function is invoked, it is pushed onto the call stack. Once the function completes its execution, it is popped off the stack.
3. Callback Queue: When asynchronous operations (like timers or network requests) complete, their corresponding callback functions are pushed onto the callback queue.
4. Event Loop: The event loop constantly checks the call stack and the callback queue. If the call stack is empty, and there are callbacks in the queue, the event loop pushes the callbacks onto the call stack, making them eligible for execution.
1. Callbacks: Callback functions are a traditional way of handling asynchronous operations. A function is passed as an argument to another function, which then invokes the callback when the operation is complete.
2. Promises: Promises provide a more structured way to handle asynchronous tasks. A promise represents a value that might be available now or in the future. It can be in one of three states: pending, fulfilled, or rejected. Promises simplify chaining asynchronous operations and error handling.
async keyword is used to declare an asynchronous function, and the
await keyword is used to pause the execution of a function until the promise is resolved.
1. Responsiveness: By offloading time-consuming tasks to the Event Loop, applications can remain responsive to user interactions.
2. Efficiency: Asynchronous operations prevent blocking the main thread, which can lead to faster and smoother user experiences.
3. Concurrency: Asynchronous code allows multiple tasks to be in progress simultaneously, improving overall efficiency.
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