Use of Set Object in JavaScript

The Set object in JavaScript is widely used in real-world applications to store and manage unique values, remove duplicates from datasets, and perform set operations like union, intersection, and difference. Its simplicity and performance make it a preferred tool in modern JavaScript development.

Why Use a Set?

• To eliminate duplicate values.
• For fast existence checks (faster than arrays).
• To store unique data such as selected items or tags.
• To perform set operations like union and intersection.

Real-World Use Cases of JavaScript Set

1. Removing Duplicates from an Array

2. Tracking Selected Items in a UI

3. Efficient Lookup (Faster than Array.includes)

4. Finding Intersection Between Two Arrays

5. Finding Union of Two Arrays

6. Finding Difference Between Two Arrays

7. Ensuring Unique Tags or Labels

Key Takeaways

• Use Set to store unique values only.
• Ideal for deduplication, selection tracking, and efficient existence checks.
• Set operations like union, intersection, and difference can be implemented easily with arrays.
• Set offers better performance for lookup compared to arrays.