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));

1function swap(x, y) {
2    return [y, x];
3}
4
5console.log(swap(2, 3));

1let a = 1;
2let b = 2;
3
4a = a ^ b;b = a ^ b;a = a ^ b;
5a; // => 2
6b; // => 1

1let a = 1;
2let b = 2;
3
4[a, b] = [b, a];
5a; // => 2
6b; // => 1

1let a = 1;
2let b = 2;
3
4a = a + b;b = a - b;a = a - b;
5a; // => 2
6b; // => 1