Плохой код

Считаю, что за такой синтаксис и его изобретение нужно ломать лицо. Добро пожаловать в мир Java$cript.

function getErrorMessage(key) {
  return $el.data(key + '-error')
    || $el.data('error')
    || key == 'native' && $el[0].validationMessage
    || options.errors[key]
}
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