How the useEffect Hook Works in ReactJS

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React Hooks were introduced in React version 16.8, offering a new way to handle state and manage side effects in functional components. Among these hooks, the useEffect hook stands out as a powerful tool for handling side effects and lifecycle events within React components. In this article, we'll dive into the workings of the useEffect hook, exploring its syntax, use cases, and best practices.

What is the useEffect Hook?

The useEffect hook allows you to perform side effects in your functional components. These side effects can include tasks like data fetching, interacting with external APIs, or managing subscriptions. It's a versatile hook that greatly enhances the capabilities of functional components.

Basic Syntax

The basic syntax of the useEffect hook consists of two arguments: a callback function and an optional dependency array.

useEffect(() => {
  // This code will run after every render.
});

Dependency Array