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

I think, I have solution that's simpler and easier to understand; it goes by slicing the number, it works up to 99 lakhs crore.

function convert_to_word(num, ignore_ten_plus_check) {

var ones = [];
var tens = [];
var ten_plus = [];
ones["1"] = "one";
ones["2"] = "two";
ones["3"] = "three";
ones["4"] = "four";
ones["5"] = "five";
ones["6"] = "six";
ones["7"] = "seven";
ones["8"] = "eight";
ones["9"] = "nine";

ten_plus["10"] = "ten";
ten_plus["11"] = "eleven";
ten_plus["12"] = "twelve";
ten_plus["13"] = "thirteen";
ten_plus["14"] = "fourteen";
ten_plus["15"] = "fifteen";
ten_plus["16"] = "sixteen";
ten_plus["17"] = "seventeen";
ten_plus["18"] = "eighteen";
ten_plus["19"] = "nineteen";

tens["1"] = "ten";
tens["2"] = "twenty";
tens["3"] = "thirty";
tens["4"] = "fourty";
tens["5"] = "fifty";
tens["6"] = "sixty";
tens["7"] = "seventy";
tens["8"] = "eighty";
tens["9"] = "ninety";   

    var len = num.length;

    if(ignore_ten_plus_check != true && len >= 2) {
        var ten_pos = num.slice(len - 2, len - 1);
        if(ten_pos == "1") {
            return ten_plus[num.slice(len - 2, len)];
        } else if(ten_pos != 0) {
            return tens[num.slice(len - 2, len - 1)] + " " + ones[num.slice(len - 1, len)];
        }
    }

    return ones[num.slice(len - 1, len)];

}

function get_rupees_in_words(str, recursive_call_count) {
  if(recursive_call_count > 1) {
        return "conversion is not feasible";
    }
    var len = str.length;
    var words = convert_to_word(str, false);
    if(len == 2 || len == 1) {
    if(recursive_call_count == 0) {
        words = words +" rupees";
    }
        return words;
    }
    if(recursive_call_count == 0) {
        words = " and " + words +" rupees";
    }



var hundred = convert_to_word(str.slice(0, len-2), true);
  words = hundred != undefined ? hundred + " hundred " + words : words;
    if(len == 3) {
        return words;
    }

var thousand = convert_to_word(str.slice(0, len-3), false);
words = thousand != undefined ? thousand  + " thousand " + words : words;
if(len <= 5) {
    return words;
}

var lakh = convert_to_word(str.slice(0, len-5), false);
words =  lakh != undefined ? lakh + " lakh " + words : words;
if(len <= 7) {
    return words;
}

recursive_call_count = recursive_call_count + 1;
return get_rupees_in_words(str.slice(0, len-7), recursive_call_count) + " crore " + words;
}

Please check out my code pen