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've modified the posting from Šime Vidas - http://jsfiddle.net/j5kdG/ To include dollars, cents, commas and "and" in the appropriate places. There's an optional ending if it requires "zero cents" or no mention of cents if 0.

This function structure did my head in a bit but I learned heaps. Thanks Sime.

Someone might find a better way of processing this.

Code:

var str='';
var str2='';
var str3 =[];

function convertNum(inp,end){
    str2='';
    str3 = [];
    var NUMBER2TEXT = {
    ones: ['', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', 'ten', 'eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen'],
    tens: ['', '', 'twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety'],
    sep: ['', ' thousand', ' million', ' billion', ' trillion', ' quadrillion', ' quintillion', ' sextillion']
};
(function( ones, tens, sep ) {
   var vals = inp.split("."),val,pos,postsep=' ';
   for (p in vals){
      val = vals[p], arr = [], str = '', i = 0;
      if ( val.length === 0 ) {return 'No value';}
      val = parseInt( (p==1 && val.length===1 )?val*10:val, 10 );
      if ( isNaN( val ) || p>=2) {return 'Invalid value'; }
      while ( val ) {
        arr.push( val % 1000 );
        val = parseInt( val / 1000, 10 );   
      }
      pos = arr.length;
      function trimx (strx) {
                return strx.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
            }
        function seps(sepi,i){
                var s = str3.length
                if (str3[s-1][0]){
                    if (str3[s-2][1] === str3[s-1][0]){
                        str = str.replace(str3[s-2][1],'')
                    }
                }
                var temp = str.split(sep[i-2]);
                if (temp.length > 1){
                    if (trimx(temp[0]) ==='' && temp[1].length > 1 ){
                        str = temp[1];
                        } 
                    }
                return sepi + str ;
        }
      while ( arr.length  ) {
        str = (function( a ) {
            var x = Math.floor( a / 100 ),
                y = Math.floor( a / 10 ) % 10,
                z = a % 10;
                postsep = (arr.length != 0)?', ' : ' ' ;
                if ((x+y+z) === 0){
                    postsep = ' '
                }else{ 
                    if (arr.length == pos-1 && x===0 && pos > 1 ){
                        postsep = ' and ' 
                    } 
                }
               str3.push([trimx(str)+"",trimx(sep[i])+""]);
                return  (postsep)+( x > 0 ? ones[x] + ' hundred ' + (( x == 0 && y >= 0 || z >0 )?' and ':' ') : ' ' ) +                  
                   ( y >= 2 ? tens[y] + ((z===0)?' ':'-') + ones[z] : ones[10*y + z] ); 
        })( arr.shift() ) +seps( sep[i++] ,i ) ;             
      }
      if (p==0){ str2 += str + ' dollars'}
      if (p==1 && !end){str2 += (str!='')?' and '+ str + ' cents':'' } 
      if (p==1 && end ){str2 += ' and ' + ((str==='')?'zero':str) + ' cents '} 
   }
})( NUMBER2TEXT.ones , NUMBER2TEXT.tens , NUMBER2TEXT.sep );