add swap problem solving

Author: munna9925

swap.js

@@ -0,0 +1,29 @@
+//before swap
+var a = 5;
+var b = 6;
+
+//After swap
+var temp = a;
+var a = b;
+var b = temp;
+console.log("after swap ", "a = ", a, "b = ", b);
+//expected output: after swap  x =  20 y =  10
+
+//Another way of doing the same thing 
+//before swap
+var x = 10;
+var y = 20;
+
+//after swap
+var x = x + y; 
+var y = x - y;
+var x = x - y;
+console.log("after swap ", "x = ", x, "y = ", y);
+//expected output: after swap  x =  20 y =  10
+
+// The above tasks can be done very easily in JavaScript.
+var p = 7;
+var q = 8;
+[p,q] = [q,p] //Set p & q with an array then invert its value
+console.log("after swap ", "p = ", p, "q = ", q);
+//expected output: after swap  p =  8 q =  7