Prototype.js check if any form element is filled

Works for text input, checkboxes, radio, select, textarea

function isFilled(e){
  var type = e.getAttribute('type');
  if(type == 'radio' || type == 'checkbox'){
    return e.checked
  } else {
    return !e.value.empty()

function anyFieldFilledIn(e){
  return'input, select, textarea').map(function(e){return isFilled(e)}).any()

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