# The JavaScript Set methods are now part of Baseline

Adriana Jara

You can now use the JavaScript ```Set methods``` to perform set operations like `intersection`, `union` and more.

Browser Support

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Sets are an essential data structure in any programming language. Now you can use JavaScript's built-in methods to perform set operations. Simplify your set operations using the following methods:

## `intersection()`

`intersection()` returns a new set containing elements in both this set and the given set.

``````const odds = new Set([1, 3, 5, 7, 9]);
const squares = new Set([1, 4, 9]);
console.log(odds.intersection(squares)); // Set(2) { 1, 9 }
``````

## `union()`

`union()` returns a new set containing all elements in this set and the given set.

``````const evens = new Set([2, 4, 6, 8]);
const squares = new Set([1, 4, 9]);
console.log(evens.union(squares)); // Set(6) { 2, 4, 6, 8, 1, 9 }
``````

## `difference()`

`difference()` returns a new set containing elements in this set but not in the given set.

``````const odds = new Set([1, 3, 5, 7, 9]);
const squares = new Set([1, 4, 9]);
console.log(odds.difference(squares)); // Set(3) { 3, 5, 7 }
``````

## `symmetricDifference()`

`symmetricDifference()` returns a new set containing elements that are in either this set or the given set, but not in both.

``````const evens = new Set([2, 4, 6, 8]);
const squares = new Set([1, 4, 9]);
console.log(evens.symmetricDifference(squares)); // Set(5) { 2, 6, 8, 1, 9 }
``````

## `isSubsetOf()`

`isSubsetOf()` returns a boolean indicating if all elements of this set are in the given set.

``````const fours = new Set([4, 8, 12, 16]);
const evens = new Set([2, 4, 6, 8, 10, 12, 14, 16, 18]);
console.log(fours.isSubsetOf(evens)); // true
``````

## `isSupersetOf()`

`isSupersetOf()` returns a boolean indicating if all elements of the given set are in this set.

``````const evens = new Set([2, 4, 6, 8, 10, 12, 14, 16, 18]);
const fours = new Set([4, 8, 12, 16]);
console.log(evens.isSupersetOf(fours)); // true
``````

## `isDisjointFrom()`

`isDisjointFrom()` Returns a boolean indicating if this set has no elements in common with the given set.

``````const primes = new Set([2, 3, 5, 7, 11, 13, 17, 19]);
const squares = new Set([1, 4, 9, 16]);
console.log(primes.isDisjointFrom(squares)); // true
``````

Updating your code to use the built-in methods improves performance and reduces technical debt.

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