Alejandro Pérez Martín AlejandroPerezMartin

## def_par_9.js
const isRequired = () => { throw new Error('param is required'); };

function filterEvil(array, evil = isRequired()) {
  return array.filter(item => item !== evil);
}
	const isRequired = () => { throw new Error('param is required'); };

	function filterEvil(array, evil = isRequired()) {
	return array.filter(item => item !== evil);
	}