var l = 25;
var x = 11;
 
function bar(foo) {
  var x = 30;
  foo();
}
 
function foo() {
  console.log("x", x); // x 11
}
 
foo.x = 20;
bar.x = 40;
 
bar(foo);
 
l.x = 100;
 
console.log("foo.x", foo.x); // х 20
console.log(bar.l); // undefined
console.log(l.x); // undefined