Mastering Conditional Rendering & Lists in React: Efficiently Displaying Dynamic Content with Best Practices

1. Introduction to Conditional Rendering and Lists in React

React dynamically updates the UI by rendering elements based on conditions and iterating over lists. Conditional rendering helps control what is displayed, while lists allow displaying multiple items efficiently.

2. Conditional Rendering in React

Conditional rendering determines whether a component or UI element should be displayed based on specific conditions.

Example: Using if Statement for Conditional Rendering

If isLoggedIn is true, the message "Welcome back!" appears; otherwise, "Please log in." is shown.

3. Using Ternary Operators for Conditional Rendering

A more concise way to conditionally render UI is using the ternary (? :) operator.

Example: Conditional Rendering with Ternary Operator

If isOnline is true, it displays "User is Online"; otherwise, "User is Offline."

Example: Rendering a Button Based on Condition

This component dynamically switches between "Login" and "Logout" buttons.

4. Using && Operator for Short-Circuit Rendering

For simpler conditions, use the logical && operator.

Example: Rendering Content Only When a Condition is True

Each item is assigned a unique key (using index here).

6. Using Keys in Lists (Best Practice)

Keys help React identify list items efficiently and prevent unnecessary re-renders.

Example: Using Unique Keys Instead of Indexes

Using id as a key ensures stable rendering even if the list order changes.

7. Combining Conditional Rendering with Lists

Conditional rendering can be applied to lists to display filtered content.

Example: Filtering and Displaying a List

If tasks exist, they are listed; otherwise, a message appears.

8. Best Practices for Conditional Rendering & Lists

•  Use && for simple conditional rendering.
• Prefer ternary operators for inline conditions with two possible outputs.
• Use map() for rendering lists instead of forEach().
• Always provide a unique key for each list item.
• Avoid using array indexes as keys unless the list won’t change dynamically.

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