Swap two variables set to integers without using a third variable

two-variable-swap.js

// Swap two variables, set to integers, 
// without using a third variable.
// Any language you want, but no Assembly.
// Register swaps are cheating for 
// this riddle.

let x = 3
let y = 5

console.log(x, y)

// Using an array
x = [x,y]
y = x.shift()
x = x.pop()

// Using addition/subtraction
x = x + y 
y = x - y 
x = x - y

// Using XOR
x = x ^ y 
y = x ^ y 
x = x ^ y

console.log("x : " + x)
console.log("y : " + y)