Codewars w Sandhika 3

function solve(dob) {
  dob = dob
    .split("")
    .map((char) => parseInt(char))
    .reduce((a, b) => a + b);
  if (dob.toString().length > 1) {
    dob = dob
      .toString()
      .split("")
      .map((char) => parseInt(char))
      .reduce((a, b) => a + b);
  }
  return dob;
}

function lifePathNumber(dateOfBirth) {
  let [year, month, date] = dateOfBirth.split("-");
  year = solve(year);
  month = solve(month);
  date = solve(date);
  let result = year + month + date;
  result = solve(result.toString());
  return result;
}

console.log(lifePathNumber("1879-03-14"), 6);
console.log(lifePathNumber("1815-12-10"), 1);
console.log(lifePathNumber("1961-07-04"), 1);
console.log(lifePathNumber("1955-10-28"), 4);
console.log(lifePathNumber("1452-04-15"), 4);
console.log(lifePathNumber("1791-12-26"), 2);
console.log(lifePathNumber("1906-12-09"), 1);
console.log(lifePathNumber("1912-06-23"), 6);
console.log(lifePathNumber("1950-08-11"), 7);
console.log(lifePathNumber("1956-01-31"), 8);
console.log(lifePathNumber("1965-04-14"), 3);
console.log(lifePathNumber("1971-06-28"), 7);