Why Event Loop is important?

What is the Event Loop?

The event loop allows Node to perform non-blocking I/O operations despite the fact that JavaScript is single-threaded. It is done by assigning operations to the operating system whenever and wherever possible....

Why Event Loop is important?

Most operating systems are multi-threaded and hence can handle multiple operations executing in the background. When one of these operations is completed, the kernel tells Node.js, and the respective callback assigned to that operation is added to the event queue which will eventually be executed. This will be explained further in detail later in this topic....

Features of Event Loop:

An event loop is an endless loop, which waits for tasks, executes them, and then sleeps until it receives more tasks. The event loop executes tasks from the event queue only when the call stack is empty i.e. there is no ongoing task. The event loop allows us to use callbacks and promises. The event loop executes the tasks starting from the oldest first....

Working of the Event loop?

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Phases of the Event loop:

When Node.js starts, it initializes the event loop, processes the provided input script which may make async API calls, schedules timers, then begins processing the event loop. In the previous example, the initial input script consisted of console.log() statements and a setTimeout() function which schedules a timer....

Conclusion

The event loop in Node.js consists of several phases, each of which performs a specific task. These phases include:...