Answers for "js set operations union intersection"

js set operations union intersection

// Union (a ∪ b)
let a = new Set([1,2,3]);
let b = new Set([4,3,2]);
let union = new Set([...a, ...b]);
    // {1,2,3,4}

// Intersection (a ∩ b)
let a = new Set([1,2,3]);
let b = new Set([4,3,2]);
let intersection = new Set(
    [...a].filter(x => b.has(x)));
    // {2,3}

// Difference (a \ b)
let a = new Set([1,2,3]);
let b = new Set([4,3,2]);
let difference = new Set(
    [...a].filter(x => !b.has(x)));
    // {1}