From the course: Master React 19 and Next.js 16 with Hands-On Projects and Real-World Applications

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Trigger, render, VirtualDOM, commit

Trigger, render, VirtualDOM, commit

From the course: Master React 19 and Next.js 16 with Hands-On Projects and Real-World Applications

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Trigger, render, VirtualDOM, commit

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In this lesson, you will understand the lifecycle of a React component. Let's break down the React rendering process using the ShoppingCard component, covering the first mount, updates when a button is clicked, component unmounting, and how React optimizes re-renders. Before we dive in, let's understand some crucial concepts in React. We will analyze this simple React component called Message. Rendering the component means that the Message function is called. This helps React calculate the JSX output. JSX output is what the function returns. The Message function returns an H1 with text Hello React. So that is our JSX output. React comes with something called the Virtual DOM. This is a lightweight JavaScript representation of the real DOM. React uses it to efficiently update the UI by comparing changes before applying them to the actual DOM. When React makes changes to the actual DOM, we call that committing. React does that efficiently by comparing the virtual DOM to the previous…

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