The latest articles on DEV Community by rukotanafreddy250 (@rukotanafreddy250). https://dev.to/rukotanafreddy250 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F322579%2Fc8daeb8d-249f-43f2-97c0-85ebd432fd47.png https://dev.to/rukotanafreddy250 en rukotanafreddy250 Thu, 23 Jan 2020 16:25:56 +0000 https://dev.to/rukotanafreddy250/my-understanding-of-an-event-loop-in-nodejs-4fjc https://dev.to/rukotanafreddy250/my-understanding-of-an-event-loop-in-nodejs-4fjc <h2> What is the Event Loop? </h2> <p>The event loop is what allows Nodejs to perform non-blocking I/O operations — despite the fact that JavaScript is single-threaded — by offloading operations to the system kernel whenever possible.</p> <h3> Event loop explained </h3> <p>When Node.js starts, it initializes the event loop, processes the provided input script which may make async API calls, schedule timers, or call process.nextTick(), then begins processing the event loop.</p> <p><a href="https://res.cloudinary.com/practicaldev/image/fetch/s--ZUjxZY3t--/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_880/https://thepracticaldev.s3.amazonaws.com/i/13sco2y5lyecfpoptslw.PNG" class="article-body-image-wrapper"><img src="https://res.cloudinary.com/practicaldev/image/fetch/s--ZUjxZY3t--/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_880/https://thepracticaldev.s3.amazonaws.com/i/13sco2y5lyecfpoptslw.PNG" alt="Alt Text"></a></p> <p>this diagram shows how event loop order of operations</p> <p>Each phase has a FIFO queue of callbacks to execute. When the queue has been exhausted or the callback limit is reached, the event loop will move to the next phase, and so on.</p> node