[Intro]

[Background Music: Friendly and engaging tone]

Instructor:

"Hey there, and welcome back! In the last lesson, we explored how useEffect helps us handle side effects in React. But to truly master useEffect, we need to understand dependency arrays—a key part of how effects work.

By the end of this lesson, you’ll understand:

✅ What dependency arrays do in useEffect.

✅ How to prevent infinite loops with proper dependency management.

✅ Common pitfalls and how to debug them.

Let’s dive in!"

1. Topic Overview

Instructor:

"When using useEffect, we pass a dependency array as the second argument. This array determines when the effect runs.

Think of the dependency array like a checklist:

• If an item on the checklist changes, React runs the effect again.
• If nothing on the list changes, the effect doesn’t run again.

Without a proper checklist, React could keep running the effect in an infinite loop or not update when expected."

2. Key Concepts with Examples