import _ from 'src/external/lodash/lodash.js';
const options = [1, 2, 3];
aexpr(() => {
  let x = 0;
  options.forEach(y => x+=y);
  lively.notify("x: " + x);
  return x;
}).onChange(lively.notify);
options[0]++;
options.values() 
Creating the hook triggers the AE Evaluation, which creates a hook and so on