I believe if you are reading this, you must have heard about the famous event loop that Node.js has, how it handles the concurrency mechanism in Node.js and how it makes Node.js a unique platform for event driven I/O.
The Event Loop is one of the most important aspects to understand about Node.js. Event Driven Programming. Being an Event driven I/O, all of the code that is executed is in the form of callbacks. Because it explains how Node.js can be asynchronous and have non-blocking I/O, and so it explains basically the "killer app" of Node.js, the thing that made it this successful. As soon as Node starts its server, it simply initiates its variables, declares functions and then simply waits for the event to occur. Event Loop Explained. When I was writing this series, there was only one illustration on the Node.js website: Event Loop Explained. This is a limitation that’s actually very helpful, as it simplifies a lot how you program without worrying about concurrency issues. If it’s the only picture on the site, then the Node team must think the event loop concept is important to understand. The Event Loopis one of the most important aspects to understand about Node. Node.js uses events heavily and it is also one of the reasons why Node.js is pretty fast compared to other similar technologies. Node.js is a single-threaded event-driven platform that is capable of running non-blocking, asynchronously programming. These functionalities of Node.js make it memory efficient. If a thread is taking a long time to execute a callback (Event Loop) or a task (Worker), we call it "blocked". I reproduced this illustration to match my mental model of the Node lifecycle, including the phases of the event loop. Why is this so important? Although events look … The Node.js JavaScript code runs on a single thread. … The Node.js JavaScript code runs on a single thread. Why is this so important? Today, event-driven programming is largely used in UI applications. shed light on how the event loop operates so you too can enjoy the magic. The event loop allows Node.js to perform non-blocking I/O operations In Node.js there are two types of threads: one Event Loop (aka the main loop, main thread, event thread, etc. Because it explains how Node can be asynchronous and have non-blocking I/O, and so it explains basically the “killer app” of Node, the thing that made it this successful. There is just one thing happening at a time. When Node.js starts, it initializes the event loop, processes the provided input script (or drops into the REPL, which is not covered in this document) which may make async API calls, schedule timers, or call process.nextTick(), then begins processing the event loop. ), and a pool of k Workers in a Worker Pool (aka the threadpool).
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