Understanding the JavaScript Event Loop
nodejs•Mar 5, 2026

Understanding the JavaScript Event Loop

The JavaScript event loop is a crucial concept for developers to understand, especially when working with asynchronous code. In this article, we'll break down the event loop, microtasks, and macrotasks, and explore how JavaScript handles concurrency.

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Key summary

This article explains the JavaScript event loop, including microtasks and macrotasks, and how JavaScript handles concurrency under the hood.

TL;DR

  • The JavaScript event loop is responsible for executing tasks in a single thread.
  • Microtasks are tasks that are executed immediately, while macrotasks are tasks that are executed after the current task is completed.
  • The event loop uses a queue to manage tasks, with microtasks being executed first.
  • JavaScript handles concurrency by using a single thread and a queue of tasks.
  • Understanding the event loop is essential for writing efficient and scalable JavaScript code.
#nodejs
#programming
#software-engineering
#javascript
#web-development

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