JavaScript Set methods allow you to work efficiently with collections of unique values.
They are useful for managing selections, filtering duplicates, handling tags, and building clean data structures.

What Are Set Methods in JavaScript?

Set methods are built-in functions that help you:

  • Add values

  • Remove values

  • Check if a value exists

  • Clear all values

  • Loop through values

  • Get the size of the Set

They work on the Set object.

Common Set Methods with One Combined Example


Explanation:

  • add() → adds a value

  • Duplicates are ignored automatically

  • has() → checks if a value exists

  • size → returns number of unique values

  • delete() → removes a value

  • forEach() → loops through values

  • clear() → removes all values

Creating a Set with Initial Values


Output:

Set(3) {"red", "blue", "green"} 

Only unique values are stored.

Why Set Methods Are Important

Understanding JavaScript Set methods helps you:

  • Remove duplicate data easily

  • Store clean collections

  • Improve performance with large datasets

  • Build better filtering logic

  • Write modern JavaScript code

Quick Summary

  • add() → add value

  • has() → check value

  • delete() → remove value

  • clear() → remove all values

  • size → count values

  • forEach() → loop through values

  • Sets always store unique values only

Conclusion

Set methods in JavaScript provide a clean and powerful way to manage unique data.
They simplify common tasks like filtering duplicates and handling collections, making your code more efficient and easier to maintain.