currency-to-words/src/converter.jsx

Converting currency to words

export const oneDigit = (digit) => {
  switch (digit) {
    case 1:
      return "one";
    case 2:
      return "two";
    case 3:
      return "three";
    case 4:
      return "four";
    case 5:
      return "five";
    case 6:
      return "six";
    case 7:
      return "seven";
    case 8:
      return "eight";
    case 9:
      return "nine";
    default:
      return "";
  }
};

export const twoDigits = (twoDigitNumber) => {
  switch (twoDigitNumber) {
    case 10:
      return "ten";
    case 11:
      return "eleven";
    case 12:
      return "twelve";
    case 13:
      return "thirteen";
    case 14:
      return "fourteen";
    case 15:
      return "fifteen";
    case 16:
      return "sixteen";
    case 17:
      return "seventeen";
    case 18:
      return "eighteen";
    case 19:
      return "nineteen";
    case 20:
      return "twenty";
    case 30:
      return "thirty";
    case 40:
      return "forty";
    case 50:
      return "fifty";
    case 60:
      return "sixty";
    case 70:
      return "seventy";
    case 80:
      return "eighty";
    case 90:
      return "ninety";
    default:
      //for numbers like 21
      const firstPart = twoDigitNumber % 10;
      const secondPart = twoDigitNumber - firstPart;

      return `${twoDigits(secondPart)}-${oneDigit(firstPart)}`;
  }
};

export const threeDigits = (threeDigits) => {
  const firstPart = oneDigit(Math.floor(threeDigits / 100)) + " hundred ";
  const secondPart = threeDigits % 100;
  return (
    firstPart + (secondPart > 9 ? twoDigits(secondPart) : oneDigit(secondPart))
  ); //for numbers like 101
};

export const GetNumericGroupTitle = (numericGroup) => {
  switch (numericGroup) {
    default:
    case 1: //hundreds doesn't need
      return "";
    case 2:
      return "thousand";
    case 3:
      return "million";
  }
};

export default {
  oneDigit,
  twoDigits,
  threeDigits,
  GetNumericGroupTitle
};