Remove repeated parts from a string (e.g. address)

unique-string-reducer.js

function uniqueStringReducer(str, options) {
  const { splitChar = '', joinChar = ', ', locale = Intl.DateTimeFormat().resolvedOptions().locale } = options || {};
  const strParts = str.split(', ').map(s => s.trim());

  const uniqueAddressParts = strParts.reduce((accumulatedParts, currentPart, i) => {

    const hasDuplicates = accumulatedParts.find(accPart => {
      const isDifferent = (currentPart.localeCompare(accPart, locale, { sensitivity: 'base' }));
      return !isDifferent;
    });

    if (!hasDuplicates) {
      accumulatedParts.push(currentPart);
    }
    
    return accumulatedParts;
  }, []);
  return uniqueAddressParts.join(joinChar);
}


console.log(uniqueStringReducer('Victor Larco Herrera   , Perú , Víctor larco Herrera, La Libertad, 13009,  Peru'));
// "Victor Larco Herrera, Perú, La Libertad, 13009"
console.log(uniqueStringReducer('Puerta del Sol, Puerta del SOL, Comunidad de Madrid, 28001, Madrid, MADRID'));
// "Puerta del Sol, Comunidad de Madrid, 28001, Madrid"