Mutable State: Global vs Local

There are two types of mutable state:

Using JavaScript as an example...

var global_state = "some state";
var doStuffUsingLocalState() = {
  var local_state = "some value";
  local_state = local_state + "some other string";
  return local_state.length();
}
var example1() {
  // change global state
  global_state = "first change!";
  // localState changed during the execution of the below
  // function, but we can't change it outside of that function.
  doStuffUsingLocalState();
}
example1();
var example2() {
  global_state = "second change!";
  return;
}
example2();