Swapping two number in javascript (3 methods)

swapTwoNumbers.js

// how to swap two variable
//*************** * way -1****************

var a = 5;
var b = 7;

console.log("brfore swap a = ",a,"and b =",b);

var temp = a;
a = b;
b = temp;
console.log("after swap a = ",a,"and b =",b);


//************ * way - 2 *****************
var x = 5;
var y = 7;
console.log("brfore swap x = ",x,"and y =",y);

x = x+y;
y = x-y;
x = x-y;

console.log("after swap x = ",x,"and y =",y);

// ***********way -3***************
// using function facilities

var p = 5 ;
var q = 7;
console.log("brfore swap p = ",p,"and q =",q);

[p,q] = [q,p];

console.log("after swap p = ",p,"and q =",q);