swap-variables.md

Swap Variables

Before ES6

• two variables

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

• three variables

var a = 'A', b = 'B', c = 'C';

// a -> b, b -> c, c -> a
c = [b, b = [a, a = c][0]][0];

// a = 'C', b = 'A', c = 'B'

ES6

• two variables

let a = 1, b = 2;
[a, b] = [b, a];

• three variables

let a = 'A', b = 'B', c = 'C';

// a -> b, b -> c, c -> a
[a, b, c] = [c, a, b];

// a = 'C', b = 'A', c = 'B'