Convert digits into words with JavaScript

Question

I am making a code which converts the given amount into words, heres is what I have got after googling. But I think its a little lengthy code to achieve a simple task. Two Regular Expressions and two for loops, I want something simpler.

I am trying to make it as shorter as possible. and will post what I come up with

Any suggestions?

var th = ['','thousand','million', 'billion','trillion'];
var dg = ['zero','one','two','three','four', 'five','six','seven','eight','nine'];
 var tn = ['ten','eleven','twelve','thirteen', 'fourteen','fifteen','sixteen', 'seventeen','eighteen','nineteen'];
 var tw = ['twenty','thirty','forty','fifty', 'sixty','seventy','eighty','ninety'];

function toWords(s) {
    s = s.toString();
    s = s.replace(/[\, ]/g,'');
    if (s != parseFloat(s)) return 'not a number';
    var x = s.indexOf('.');
    if (x == -1)
        x = s.length;
    if (x > 15)
        return 'too big';
    var n = s.split(''); 
    var str = '';
    var sk = 0;
    for (var i=0;   i < x;  i++) {
        if ((x-i)%3==2) { 
            if (n[i] == '1') {
                str += tn[Number(n[i+1])] + ' ';
                i++;
                sk=1;
            } else if (n[i]!=0) {
                str += tw[n[i]-2] + ' ';
                sk=1;
            }
        } else if (n[i]!=0) { // 0235
            str += dg[n[i]] +' ';
            if ((x-i)%3==0) str += 'hundred ';
            sk=1;
        }
        if ((x-i)%3==1) {
            if (sk)
                str += th[(x-i-1)/3] + ' ';
            sk=0;
        }
    }

    if (x != s.length) {
        var y = s.length;
        str += 'point ';
        for (var i=x+1; i<y; i++)
            str += dg[n[i]] +' ';
    }
    return str.replace(/\s+/g,' ');
}

Also, the above code converts to English numbering system like Million/Billion, I wan't South Asian numbering system. like in Lakhs and Crores

Answer 1

Lot of good answers. I needed mine for Indian (South Asian) numbering system. I modified one of the codes above - attaching it here, in case, someone else needs this. In the Indian numbering system, groups after thousands are in in 2 digits, not 3 as in the western system.

var IS_SOUTH_ASIAN = true;
function int_to_words(int) {
  if (int === 0) return 'zero';

  var ONES_WORD  = ['','one','two','three','four','five','six','seven','eight','nine','ten','eleven','twelve','thirteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen'];
  var TENS_WORD  = ['','','twenty','thirty','fourty','fifty','sixty','seventy','eighty','ninety'];
  var SCALE_WORD_WESTERN = ['','thousand','million','billion','trillion','quadrillion','quintillion','sextillion','septillion','octillion','nonillion'];
  var SCALE_WORD_SOUTH_ASIAN = ['','thousand','lakh','crore','arab','kharab','neel','padma','shankh','***','***'];

  var GROUP_SIZE = (typeof IS_SOUTH_ASIAN != "undefined" && IS_SOUTH_ASIAN) ? 2 : 3;
  var SCALE_WORD = (typeof IS_SOUTH_ASIAN != "undefined" && IS_SOUTH_ASIAN) ? SCALE_WORD_SOUTH_ASIAN : SCALE_WORD_WESTERN;


  // Return string of first three digits, padded with zeros if needed
  function get_first_3(str) {
    return ('000' + str).substr(-(3));
  }
  function get_first(str) { //-- Return string of first GROUP_SIZE digits, padded with zeros if needed, if group size is 2, make it size 3 by prefixing with a '0'
    return (GROUP_SIZE == 2 ? '0' : '') + ('000' + str).substr(-(GROUP_SIZE));
  }


  // Return string of digits with first three digits chopped off
  function get_rest_3(str) {
    return str.substr(0, str.length - 3);
  }
  function get_rest(str) { // Return string of digits with first GROUP_SIZE digits chopped off
    return str.substr(0, str.length - GROUP_SIZE);
  }

  // Return string of triplet convereted to words
  function triplet_to_words(_3rd, _2nd, _1st) {
    return  (_3rd == '0' ? '' : ONES_WORD[_3rd] + ' hundred ') + 
            (_1st == '0' ? TENS_WORD[_2nd] : TENS_WORD[_2nd] && TENS_WORD[_2nd] + '-' || '') + 
            (ONES_WORD[_2nd + _1st] || ONES_WORD[_1st]);  //-- 1st one returns one-nineteen - second one returns one-nine
  }

  // Add to result, triplet words with scale word
  function add_to_result(result, triplet_words, scale_word) {
    return triplet_words ? triplet_words + (scale_word && ' ' + scale_word || '') + ' ' + result : result;
  }

  function recurse (result, scaleIdx, first, rest) {
    if (first == '000' && rest.length === 0) return result;
    var newResult = add_to_result (result, triplet_to_words (first[0], first[1], first[2]), SCALE_WORD[scaleIdx]);
    return recurse (newResult, ++scaleIdx, get_first(rest), get_rest(rest));
  }

  return recurse ('', 0, get_first_3(String(int)), get_rest_3(String(int)));
}

Answer 2

 var units = ["", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
var tens = ["", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"];



function convert7digitIntoWords(num) {
    var remainder = num % 1000000
    var hun = num - remainder;
    var div = Math.floor(num / 100000);
    if (remainder !== 0)
        return (convert2digitIntoWords(div) + " lakhs " + convert5digitIntoWords(remainder % 100000))
    else
        return (convert2digitIntoWords(div) + " lakhs ")
}

function convert6digitIntoWords(num) {
    var remainder = num % 100000
    var hun = num - remainder;
    var div = Math.floor(num / 100000);
    if (remainder !== 0)
        return (units[div] + " lakh " + convert5digitIntoWords(remainder))
    else
        return (units[div] + " lakh ")
}

function convert5digitIntoWords(num) {
    var remainder = num % 10000
    var hun = num - remainder;
    var div = Math.floor(num / 1000);
    if (remainder !== 0)
        return (convert2digitIntoWords(div) + " thousand " + convert3digitIntoWords(remainder % 1000))
    else
        return (convert2digitIntoWords(div) + " thousand")
}

function convert4digitIntoWords(num) {
    var remainder = num % 1000
    var hun = num - remainder;
    var div = Math.floor(num / 1000);
    if (remainder !== 0)
        return (units[div] + " thousand " + convert3digitIntoWords(remainder))
    else
        return (units[div] + " thousand")
}


function convert3digitIntoWords(num) {
    var remainder = num % 100
    var hun = num - remainder;
    var div = Math.floor(num / 100);
    if (remainder !== 0)
        return (units[div] + " hundred " + convert2digitIntoWords(remainder))
    else
        return (units[div] + " hundred ")
}

function convert2digitIntoWords(num) {
    var remainder = num % 10;
    var div = Math.floor(num / 10);
    return (tens[div] + " " + convertNumIntoWords(remainder));
}

function convertNumIntoWords(num) {

    switch (("" + num).length) {
        case 1:
            return units[num];
        case 2:
            return convert2digitIntoWords(num);
        case 3:
            return convert3digitIntoWords(num)
        case 4:
            return convert4digitIntoWords(num)
        case 5:
            return convert5digitIntoWords(num)
        case 6:
            return convert6digitIntoWords(num)
        case 7:
            return convert7digitIntoWords(num)
        default:
            return "cannot be converted"
    }
}

console.log(convertNumIntoWords(3445125));

Answer 3

I modified @McShaman's code, converted it to CoffeeScript, and added docs via JSNice. Here's the result, for those interested (English):

###
    Convert an integer to an English string equivalent
    @param {Integer} number the integer to be converted
    @return {String} the English number equivalent
###
inWords = (number) ->
    ###
        @property {Array}
    ###
    englishIntegers = [
        ""
        "one "
        "two "
        "three "
        "four "
        "five "
        "six "
        "seven "
        "eight "
        "nine "
        "ten "
        "eleven "
        "twelve "
        "thirteen "
        "fourteen "
        "fifteen "
        "sixteen "
        "seventeen "
        "eighteen "
        "nineteen "
    ]

    ###
        @property {Array}
    ###
    englishIntegerTens = [
        ""
        ""
        "twenty"
        "thirty"
        "forty"
        "fifty"
        "sixty"
        "seventy"
        "eighty"
        "ninety"
    ]

    ###
        @property {Array}
    ###
    englishIntegerThousands = [
        "thousand"
        "million"
        ""
    ]
    number = number.toString()
    return "" if number.length > 9

    ###
        @property {string}
    ###
    number = ("000000000" + number).substr(-9)

    ###
      @property {(Array.<string>|null)}
      ###
    number = number.match(/.{3}/g)

    ###
        @property {string}
    ###
    convertedWords = ""

    ###
        @property {number}
    ###
    i = 0
    while i < englishIntegerThousands.length

        ###
            @property {string}
        ###
        currentNumber = number[i]

        ###
            @property {string}
        ###
        tempResult = ""
        tempResult += (if convertedWords isnt "" then " " + englishIntegerThousands[i] + " " else "")
        tempResult += (if currentNumber[0] isnt 0 then englishIntegers[Number(currentNumber[0])] + "hundred " else "")

        ###
            @property {string}
        ###
        currentNumber = currentNumber.substr(1)
        tempResult += (if currentNumber isnt 0 then ((if tempResult isnt "" then "and " else "")) + (englishIntegers[Number(currentNumber)] or englishIntegerTens[currentNumber[0]] + " " + englishIntegers[currentNumber[1]]) else "")
        convertedWords += tempResult
        i++
    convertedWords

Answer 4

 <html>

<head>

    <title>HTML - Convert numbers to words using JavaScript</title>

    <script  type="text/javascript">
    	function onlyNumbers(evt) {
    var e = event || evt; // For trans-browser compatibility
    var charCode = e.which || e.keyCode;

    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;
    return true;
}

function NumToWord(inputNumber, outputControl) {
    var str = new String(inputNumber)
    var splt = str.split("");
    var rev = splt.reverse();
    var once = ['Zero', ' One', ' Two', ' Three', ' Four', ' Five', ' Six', ' Seven', ' Eight', ' Nine'];
    var twos = ['Ten', ' Eleven', ' Twelve', ' Thirteen', ' Fourteen', ' Fifteen', ' Sixteen', ' Seventeen', ' Eighteen', ' Nineteen'];
    var tens = ['', 'Ten', ' Twenty', ' Thirty', ' Forty', ' Fifty', ' Sixty', ' Seventy', ' Eighty', ' Ninety'];

    numLength = rev.length;
    var word = new Array();
    var j = 0;

    for (i = 0; i < numLength; i++) {
        switch (i) {

            case 0:
                if ((rev[i] == 0) || (rev[i + 1] == 1)) {
                    word[j] = '';
                }
                else {
                    word[j] = '' + once[rev[i]];
                }
                word[j] = word[j];
                break;

            case 1:
                aboveTens();
                break;

            case 2:
                if (rev[i] == 0) {
                    word[j] = '';
                }
                else if ((rev[i - 1] == 0) || (rev[i - 2] == 0)) {
                    word[j] = once[rev[i]] + " Hundred ";
                }
                else {
                    word[j] = once[rev[i]] + " Hundred and";
                }
                break;

            case 3:
                if (rev[i] == 0 || rev[i + 1] == 1) {
                    word[j] = '';
                }
                else {
                    word[j] = once[rev[i]];
                }
                if ((rev[i + 1] != 0) || (rev[i] > 0)) {
                    word[j] = word[j] + " Thousand";
                }
                break;

                
            case 4:
                aboveTens();
                break;

            case 5:
                if ((rev[i] == 0) || (rev[i + 1] == 1)) {
                    word[j] = '';
                }
                else {
                    word[j] = once[rev[i]];
                }
                if (rev[i + 1] !== '0' || rev[i] > '0') {
                    word[j] = word[j] + " Lakh";
                }
                 
                break;

            case 6:
                aboveTens();
                break;

            case 7:
                if ((rev[i] == 0) || (rev[i + 1] == 1)) {
                    word[j] = '';
                }
                else {
                    word[j] = once[rev[i]];
                }
                if (rev[i + 1] !== '0' || rev[i] > '0') {
                    word[j] = word[j] + " Crore";
                }                
                break;

            case 8:
                aboveTens();
                break;

            //            This is optional. 

            //            case 9:
            //                if ((rev[i] == 0) || (rev[i + 1] == 1)) {
            //                    word[j] = '';
            //                }
            //                else {
            //                    word[j] = once[rev[i]];
            //                }
            //                if (rev[i + 1] !== '0' || rev[i] > '0') {
            //                    word[j] = word[j] + " Arab";
            //                }
            //                break;

            //            case 10:
            //                aboveTens();
            //                break;

            default: break;
        }
        j++;
    }

    function aboveTens() {
        if (rev[i] == 0) { word[j] = ''; }
        else if (rev[i] == 1) { word[j] = twos[rev[i - 1]]; }
        else { word[j] = tens[rev[i]]; }
    }

    word.reverse();
    var finalOutput = '';
    for (i = 0; i < numLength; i++) {
        finalOutput = finalOutput + word[i];
    }
    document.getElementById(outputControl).innerHTML = finalOutput;
}
    </script>

</head>

<body>

    <h1>

        HTML - Convert numbers to words using JavaScript</h1>

    <input id="Text1" type="text" onkeypress="return onlyNumbers(this.value);" onkeyup="NumToWord(this.value,'divDisplayWords');"

        maxlength="9" style="background-color: #efefef; border: 2px solid #CCCCC; font-size: large" />

    <br />

    <br />

    <div id="divDisplayWords" style="font-size: 13; color: Teal; font-family: Arial;">

    </div>

</body>

</html>

Answer 5

If you need with Cent then you may use this one

        <script>
            var iWords = ['zero', ' one', ' two', ' three', ' four', ' five', ' six', ' seven', ' eight', ' nine'];
            var ePlace = ['ten', ' eleven', ' twelve', ' thirteen', ' fourteen', ' fifteen', ' sixteen', ' seventeen', ' eighteen', ' nineteen'];
            var tensPlace = ['', ' ten', ' twenty', ' thirty', ' forty', ' fifty', ' sixty', ' seventy', ' eighty', ' ninety'];
            var inWords = [];

            var numReversed, inWords, actnumber, i, j;

            function tensComplication() {
            if (actnumber[i] == 0) {
                inWords[j] = '';
            } else if (actnumber[i] == 1) {
                inWords[j] = ePlace[actnumber[i - 1]];
            } else {
                inWords[j] = tensPlace[actnumber[i]];
            }
            }

            function convertAmount() {
                var numericValue = document.getElementById('bdt').value;
                numericValue = parseFloat(numericValue).toFixed(2);

                var amount = numericValue.toString().split('.');
                var taka = amount[0];
                var paisa = amount[1];
                document.getElementById('container').innerHTML = convert(taka) +" taka and "+ convert(paisa)+" paisa only";
            }
            function convert(numericValue) {
            inWords = []
            if(numericValue == "00" || numericValue =="0"){
                return 'zero';
            }
            var obStr = numericValue.toString();
            numReversed = obStr.split('');
            actnumber = numReversed.reverse();


            if (Number(numericValue) == 0) {
                document.getElementById('container').innerHTML = 'BDT Zero';
                return false;
            }

            var iWordsLength = numReversed.length;
            var finalWord = '';
            j = 0;
            for (i = 0; i < iWordsLength; i++) {
                switch (i) {
                    case 0:
                        if (actnumber[i] == '0' || actnumber[i + 1] == '1') {
                            inWords[j] = '';
                        } else {
                            inWords[j] = iWords[actnumber[i]];
                        }
                        inWords[j] = inWords[j] + '';
                        break;
                    case 1:
                        tensComplication();
                        break;
                    case 2:
                        if (actnumber[i] == '0') {
                            inWords[j] = '';
                        } else if (actnumber[i - 1] !== '0' && actnumber[i - 2] !== '0') {
                            inWords[j] = iWords[actnumber[i]] + ' hundred';
                        } else {
                            inWords[j] = iWords[actnumber[i]] + ' hundred';
                        }
                        break;
                    case 3:
                        if (actnumber[i] == '0' || actnumber[i + 1] == '1') {
                            inWords[j] = '';
                        } else {
                            inWords[j] = iWords[actnumber[i]];
                        }
                        if (actnumber[i + 1] !== '0' || actnumber[i] > '0') {
                            inWords[j] = inWords[j] + ' thousand';
                        }
                        break;
                    case 4:
                        tensComplication();
                        break;
                    case 5:
                        if (actnumber[i] == '0' || actnumber[i + 1] == '1') {
                            inWords[j] = '';
                        } else {
                            inWords[j] = iWords[actnumber[i]];
                        }
                        if (actnumber[i + 1] !== '0' || actnumber[i] > '0') {
                            inWords[j] = inWords[j] + ' lakh';
                        }
                        break;
                    case 6:
                        tensComplication();
                        break;
                    case 7:
                        if (actnumber[i] == '0' || actnumber[i + 1] == '1') {
                            inWords[j] = '';
                        } else {
                            inWords[j] = iWords[actnumber[i]];
                        }
                        inWords[j] = inWords[j] + ' crore';
                        break;
                    case 8:
                        tensComplication();
                        break;
                    default:
                        break;
                }
                j++;
            }


            inWords.reverse();
            for (i = 0; i < inWords.length; i++) {
                finalWord += inWords[i];
            }
            return finalWord;
            }

        </script>

        <input type="text" name="bdt" id="bdt" />
        <input type="button" name="sr1" value="Click Here" onClick="convertAmount()"/>

        <div id="container"></div>

js fiddle

Here taka mean USD and paisa mean cent

Answer 6

Converting the input string into a number rather than keeping it as a string, limits the solution to the maximum allowed float / integer value on that machine/browser. My script below handles currency up to 1 Trillion dollars - 1 cent :-). I can be extended to handle up to 999 Trillions by adding 3 or 4 lines of code.

var ones = ["","One","Two","Three","Four","Five","Six","Seven","Eight",
            "Nine","Ten","Eleven","Twelve","Thirteen","Fourteen",
            "Fifteen","Sixteen","Seventeen","Eighteen","Nineteen"]; 

var tens = ["","","Twenty","Thirty","Forty","Fifty","Sixty","Seventy",
            "Eighty","Ninety"]; 


function words999(n999)   {    // n999 is an integer less than or equal to 999.
//
// Accept any 3 digit int incl 000 & 999 and return words.
// 

    var words = ''; var Hn = 0; var n99 = 0;

    Hn = Math.floor(n999 / 100);                  // # of hundreds in it

    if (Hn > 0)   {                               // if at least one 100

      words = words99(Hn) + " Hundred";           // one call for hundreds
    }

    n99 = n999 - (Hn * 100);                      // subtract the hundreds.

    words += ((words == '')?'':' ') + words99(n99); // combine the hundreds with tens & ones.

    return words;
}                            // function words999( n999 )

function words99(n99)   {    // n99 is an integer less than or equal to 99.
//
// Accept any 2 digit int incl 00 & 99 and return words.
// 

    var words = ''; var Dn = 0; var Un = 0;

    Dn = Math.floor(n99 / 10);           // # of tens

    Un = n99 % 10;                       // units

    if (Dn > 0 || Un > 0) {

      if (Dn < 2) {

        words += ones[Dn * 10 + Un];     // words for a # < 20

      } else {

        words += tens[Dn];

        if (Un > 0) words += "-" + ones[Un];
      }
    }                               // if ( Dn > 0 || Un > 0 )

    return words;
}                                   // function words99( n99 )

function getAmtInWords(id1, id2) {  // use numeric value of id1 to populate text in id2 
//
// Read numeric amount field and convert into word amount
// 

    var t1 = document.getElementById(id1).value;

    var t2 = t1.trim();

    amtStr = t2.replace(/,/g,'');        // $123,456,789.12 = 123456789.12

    dotPos = amtStr.indexOf('.');        // position of dot before cents, -ve if it doesn't exist.

    if (dotPos > 0) {

      dollars = amtStr.slice(0,dotPos);  // 1234.56 = 1234
      cents   = amtStr.slice(dotPos+1);  // 1234.56 = .56

    } else if (dotPos == 0) {

      dollars = '0';
      cents   = amtStr.slice(dotPos+1);  // 1234.56 = .56

    } else {

      dollars = amtStr.slice(0);         // 1234 = 1234
      cents   = '0'; 
    }

    t1      = '000000000000' + dollars;  // to extend to trillion, use 15 zeros
    dollars =  t1.slice(-12);            // and -15 here.

    billions  = Number(dollars.substr(0,3));
    millions  = Number(dollars.substr(3,3));
    thousands = Number(dollars.substr(6,3));
    hundreds  = Number(dollars.substr(9,3));

    t1 = words999(billions);    bW = t1.trim();   // Billions  in words

    t1 = words999(millions);    mW = t1.trim();   // Millions  in words

    t1 = words999(thousands);   tW = t1.trim();   // Thousands in words

    t1 = words999(hundreds);    hW = t1.trim();   // Hundreds  in words

    t1 = words99(cents);        cW = t1.trim();   // Cents     in words

    var totAmt = '';

    if (bW != '')   totAmt += ((totAmt != '') ? ' '  : '') + bW + ' Billion';
    if (mW != '')   totAmt += ((totAmt != '') ? ' '  : '') + mW + ' Million';
    if (tW != '')   totAmt += ((totAmt != '') ? ' '  : '') + tW + ' Thousand';
    if (hW != '')   totAmt += ((totAmt != '') ? ' '  : '') + hW + ' Dollars';

    if (cW != '')   totAmt += ((totAmt != '') ? ' and ' : '') + cW + ' Cents';

//  alert('totAmt = ' + totAmt);    // display words in a alert

    t1 = document.getElementById(id2).value;

    t2 = t1.trim();

    if (t2 == '')  document.getElementById(id2).value = totAmt;

    return false;
}                        // function getAmtInWords( id1, id2 )

// ======================== [ End Code ] ====================================