Next, write the last article《 Understand the Set structure in ES6 》At the end of the summary, I saw a【 ES6 Array Extension 】To realize the method of "finding union, intersection and difference sets of two sets".

It is very simple. The implementation method is as follows:

 let a = new Set([1, 2, 3]); let b = new Set([4, 3, 2]); //Union let union = new Set([...a, ...b]); console.log(union); //  Set(4) {1, 2, 3, 4} //Intersection let intersect = new Set([...a].filter(x => b.has(x))); console.log(intersect); //  Set(2) {2, 3} //Difference set let difference = new Set([...a].filter(x => !b.has(x))); console.log(difference); //  Set(1) {1}