parse-words-to-numbers.js

const parseInt = string => {
  var n = 0, 
      g = 0;
  
  function text2num(s) {
    const a = s.toString().split(/[\s-]+/);
    a.forEach(feach);
    return n + g;
  }
  
  const feach = w => {
    let x = numbers[w];
    if (x) g = g + x;
    else if (w == 'hundred') g = g * 100;
    else {
      x = magnitude[w];
      if (x) {
        n = n + g * x;
        g = 0;
      }
    }
  }

  return text2num(string);
}

const numbers = {
  '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 magnitude = {
  'thousand':     1000,
  'million':      1000000,
  'billion':      1000000000,
  'trillion':     1000000000000,
  'quadrillion':  1000000000000000,
  'quintillion':  1000000000000000000,
  'sextillion':   1000000000000000000000,
  'septillion':   1000000000000000000000000,
  'octillion':    1000000000000000000000000000,
  'nonillion':    1000000000000000000000000000000,
  'decillion':    1000000000000000000000000000000000
};