useEffect example 70

What this example teaches

useEffect

Output

The component renders tasks, filters and loading state and updates when state or props change.

Line-by-line explanation

• Line 1 sets up the useEffect example: import { useEffect, useState } from "react";.
• Line 2 adds one required part of the working pattern: blank line.
• Line 3 adds one required part of the working pattern: export function OrdersPanel() {.
• Line 4 adds one required part of the working pattern: const [orders, setOrders] = useState([]);.
• Line 5 adds one required part of the working pattern: useEffect(() => { fetch("/api/orders").then((res) => res.json()).then(setOrders); }, []);.
• Line 6 exposes the output so you can verify the behavior: return <p>{orders.length} orders loaded</p>;.

Why this example is useful

This example is useful because it isolates useeffect without surrounding noise, so you can see the idea clearly.

Where it is used in real projects

useEffect appears in real React work when a feature needs a clear pattern that can be reviewed and changed safely.

Beginner variation

Change one label, value or condition in the useEffect example and run it again.

Advanced variation

Combine useEffect with validation, error handling or reusable structure.