Numbers to words

numbersToWords.js

const lookup = {
  zero: 0,
  one: 1,
  two: 2,
  three: 3,
  four: 4,
  five: 5,
  six: 6,
  seven: 7,
  eight: 8,
  nine: 9
};

function numToString(str) {
  return str.replace(/(\w+);/g, (s, m) => lookup[m]);
}

console.log(numToString('one;two;three;four;'));
console.log(numToString('eight;three;two;one;seven;'));