JavaScript set Intersection (a ∩ b): create a set that contains those elements of set a that are also in a set b. You have to convert the set into an array and use the filter method for it.
To get the intersection of two Sets:
- Convert the first
Setinto an array. - Use the
filter()method to iterate over the array. - Use the
has()method to check if each value is contained in the secondSet. - Convert the array back to a
Set.
JavaScript Set intersection
Simple example code converts a to an array, filters the elements, and converts the result to a set.
<!DOCTYPE html>
<html>
<body>
<script>
let a = new Set([1,2,3]);
let b = new Set([4,3,2]);
let itrs = new Set([...a].filter(x => b.has(x)));
console.log(itrs)
</script>
</body>
</html>Output:
Another example
function getIntersection(setA, setB) {
const intersection = new Set(
[...setA].filter(element => setB.has(element))
);
return intersection;
}
const set1 = new Set(['a', 'b', 'c']);
const set2 = new Set(['a', 'b', 'd', 'e']);
console.log(getIntersection(set1, set2)); // 👉️ {'a', 'b'}
Do comment if you have any doubts or suggestions on this set topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version