Number to words QB -> nodejs conversion.

[EkBass]

Hi.

I was looking old snippets on one Finnish programming site and noticed this: Ohjelmointiputka: Koodit: QB: Luku kirjoitettuna

It is a QB code that converts numbers to words, in Finnish.

You can guess rest and here is conversion of it in nodejs. I also translated numbers in english. I am almost sure it works just fine now. Though there is way too many numbers to test, so i promise it is almost almost fully functional.

/*
    Numbers to words snippet for nodejs.
    Original idea: https://www.ohjelmointiputka.net/koodivinkit/23425-qb-luku-kirjoitettuna
    
    [email protected] 2024
    Public domain, free as air, do-what-you-want license and no promise it wont explod your computer.
*/   

// Requires: npm install readline-sync
const readline = require('readline-sync');

// Array to store numbers as words
const numbers = [
  "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine",
  "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen",
  "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety",
  "hundred", "thousand", "million", "billion", "trillion"
];

function sky(characters) {
  let result = "";

  // tens and "units"
  if (characters[1] === '0') {
    if (characters[2] !== '0') {
      result = numbers[parseInt(characters[2])];
    }
  } else if (characters[1] === '1') {
    result = numbers[10 + parseInt(characters[2])]; // 11 to 19
  } else {
    result = numbers[18 + parseInt(characters[1])]; // 20, 30...90
    if (characters[2] !== '0') {
      result += "-" + numbers[parseInt(characters[2])];
    }
  }

  // Hundreds
  if (characters[0] !== '0') {
    result = numbers[parseInt(characters[0])] + " " + numbers[28] + (result ? " and " + result : "");
  }

  return result;
}

// prime function for convert numbers to words
function numberToWords(numberStr) {
  if (numberStr.length > 18) {
    return "Too big a number!";
  }

  // "pad" the number string to make its length a multiple of 3
  while (numberStr.length % 3 !== 0) {
    numberStr = "0" + numberStr;
  }

  let result = "";
  const groupSuffixes = ["", "thousand", "million", "billion", "trillion"];
 
  for (let i = 0; i < numberStr.length / 3; i++) {
    const segment = numberStr.substring(numberStr.length - (i + 1) * 3, numberStr.length - i * 3);
    const segmentWords = sky(segment);

    if (segmentWords) {
      if (i > 0) {
        result = segmentWords + " " + groupSuffixes[i] + (result ? " " + result : "");
      } else {
        result = segmentWords + (result ? " " + result : "");
      }
    }
  }

  return result || numbers[0];
}

// Lets use it.
const numberInput = readline.question("Enter number: ");
const numberOutput = numberToWords(numberInput);
console.log(numberOutput);