Question

In the scenario below, how can I get references to the variables declared during eval() if I do not know their names?

function test() {
  eval("var myVariable = 5");
  var locals = magic() // TODO What should we do here?
  alert(locals["myVariable"]); // returns myVariable
}

Just a note: JavaScript being evaluated comes from a trusted source.

Answer 1

eval() runs in the same scope as the caller, so this will work:

function test() {
  eval("var myVariable = 5");
  var locals = {};
  locals.myVariable = myVariable; // TODO What should we do here?
  alert(locals["myVariable"]); // returns myVariable
}

But you can’t determine what variables were declared in the eval() call (if that’s what you want)