How JS scoping messes with capture

gistfile1.js

var a = {};

a.foo = function() {
  return "foo";
}

a.bar = function() {
  return "bar";
}

var b = {other: a};
for (var f in a) {
  b[f] = function(local_f) {
    return a[local_f].call(a);
  }(f)
}

b.foo();