codewars kata of parseInt.js 4kyu solution

parseInt().js

function parseInt(string) {
  // TODO: it's your task now
  const dictionary = {"zero":0,"one":1,"two":2,"three":3,"four":4,"five":5,"six":6,"seven":7,"eight":8,"nine":9,"ten":10,"eleven":11,"twelve":12,"thirteen":13,"fourteen":14,"fifteen":15,"sixteen":16,"seventeen":17,"eighteen":18,"nineteen":19,
    "twenty":20, "thirty":30, "forty":40, "fifty":50, "sixty":60, "seventy":70, "eighty":80, "ninety":90};
  const multi = {
    'hundred': 100,
    'thousand': 1000,
    'million': 1000000
  }
  const words = string.split(/ |-/)
  let duplicate_words = [...words]
  let result = 0
  let prev = 0
  for (let i of words) {
    if (dictionary[i]) {
      result += dictionary[i]
      prev += dictionary[i]
      duplicate_words.shift()
    }
    else if (multi[i]) {
      let multiplier = multi[i]
      for (let j of duplicate_words) {
            if (multi[j] > multiplier) {
                multiplier = multiplier * multi[j]
                break;
            }
        }
      result += (prev * multiplier) - prev
      prev = 0
      duplicate_words.shift()
    }
  }
  return result
}

console.log(parseInt('twenty-six thousand three hundred fifty-nine'))
console.log(parseInt('six hundred sixty-six thousand six hundred sixty-six'))