Watcher for name format

nameParse.js

window.nameParse = function(name){
  let nameExploded = val
          .split(' ')
          .filter(function (v) {
              return v.trim().length > 0;
          });
      nameExploded=nameExploded.map(function (val) {
          if(
              ([
                  "de",
                  "do",
                  "da",
                  "di",
                  "du"
              ]).includes(val)
          ) return val.toLowerCase();
          else {
              let subNameExploded = val
                  .split("'")
                  .filter(function (v) {
                      return v.trim().length > 0;
                  });
              subNameExploded=subNameExploded.map(function(word){
                  return word.charAt(0).toUpperCase()+word.slice(1).toLowerCase();
              });
              return subNameExploded.join("'");
          }
      });
      return nameExploded.join(' ');
}