One of the basic `Set`

operations is to get the difference of two sets. In mathematical terms, this is expressed as `A - B`

(i.e. set of all elements of "A" that are *not* elements of "B").

Please note that this is different than the symmetric difference of two sets (where you get all the uncommon elements between two sets).

To get a difference between two JavaScript `Set`

objects, you can simply loop over the elements of `Set`

"B" and remove elements that it has common with `Set`

"A". This would leave you with all elements of "A" that are *not* elements of "B". For example:

function difference(setA, setB) { const diff = new Set(setA); for (const elem of setB) { diff.delete(elem); } return diff; } const setA = new Set([1, 2, 3, 4]); const setB = new Set([3, 4, 5, 6]); console.log(difference(setA, setB)); // Set(2) {1, 2} console.log(difference(setB, setA)); // Set(2) {5, 6}

Hope you found this post useful. It was published . Please show your love and support by sharing this post.