owo Pass-by-reference test

owo Swap two variables.
functio swap(left, right) {
   var tmp = left;
   left = right;
   right = tmp;
}

var foo = /*hello*/;
var bar = /*world*/;

swap(foo, bar);

if (foo != /*world*/) {
   /*FAILED*/ print;
   /*foo should be 'world', is actually:*/ print;
   foo print;
}

if (foo == /*world*/) {
   /*OK*/ print;
}