Recursive string split in JavaScript written in Erlang style

recursiveErlangStyleStringSplit.js

const usePrologStyleList = (array) => {
  const [head, ...tail] = array;
  return [head, tail];
};

const useErlangStyleString = (string, resultString) => {
  const length = string.length;
  if (!length) {
    return resultString;
  }
  return useErlangStyleString(string.substr(0, length - 1), [string.charCodeAt(length - 1)].concat(resultString));
};

const splitString = (string, separator, words, acc) => {
  const [head, tail] = usePrologStyleList(string);

  if (head === undefined) {
    return words.concat([acc]).map(word => String.fromCharCode(...word));
  }

  if (head === separator) {
    return splitString(tail, separator, words.concat([acc]), []);
  } else {
    return splitString(tail, separator, words, acc.concat(head));
  }
};

Use case:

const string = useErlangStyleString('Erlang is fun!', []);
const result = splitString(string, ' '.charCodeAt(0), [], []);
console.log(result);

Result:

[ 'Erlang', 'is', 'fun!' ]