1var a = 1,
2    b = 2;
3b = [a, a = b][0];

1var a = 5;
2var b = 3;
3[a, b] = [b, a];

1function swap(x, y) {
2    var t = x;
3    x = y;
4    y = t;
5    return [x, y];
6}
7
8console.log(swap(2, 3));

1let a = "red";
2let b = "blue";
3let c = a; // red
4a = b; //over-rides to blue
5b = c;
6
7console.log(a);
8console.log(b);