JavaScript numbers to Words

Question

I\'m trying to convert numbers into english words, for example 1234 would become: \"one thousand two hundred thirty four\".

My Tact

Answer 1

Your problem is already solved but I am posting another way of doing it just for reference.

The code was written to be tested on node.js, but the functions should work fine when called within the browser. Also, this only handles the range [0,1000000], but can be easily adapted for bigger ranges.

// actual  conversion code starts here

var ones = ['', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'];
var tens = ['', '', 'twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety'];
var teens = ['ten', 'eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen'];

function convert_millions(num) {
  if (num >= 1000000) {
    return convert_millions(Math.floor(num / 1000000)) + " million " + convert_thousands(num % 1000000);
  } else {
    return convert_thousands(num);
  }
}

function convert_thousands(num) {
  if (num >= 1000) {
    return convert_hundreds(Math.floor(num / 1000)) + " thousand " + convert_hundreds(num % 1000);
  } else {
    return convert_hundreds(num);
  }
}

function convert_hundreds(num) {
  if (num > 99) {
    return ones[Math.floor(num / 100)] + " hundred " + convert_tens(num % 100);
  } else {
    return convert_tens(num);
  }
}

function convert_tens(num) {
  if (num < 10) return ones[num];
  else if (num >= 10 && num < 20) return teens[num - 10];
  else {
    return tens[Math.floor(num / 10)] + " " + ones[num % 10];
  }
}

function convert(num) {
  if (num == 0) return "zero";
  else return convert_millions(num);
}

//end of conversion code

//testing code begins here

function main() {
  var cases = [0, 1, 2, 7, 10, 11, 12, 13, 15, 19, 20, 21, 25, 29, 30, 35, 50, 55, 69, 70, 99, 100, 101, 119, 510, 900, 1000, 5001, 5019, 5555, 10000, 11000, 100000, 199001, 1000000, 1111111, 190000009];
  for (var i = 0; i < cases.length; i++) {
    console.log(cases[i] + ": " + convert(cases[i]));
  }
}

main();