Nodejs Number Format formatBytes()

Method Source Code

Number.prototype.formatBytes = function() {
    var units = ['Bytes', 'KBytes', 'MBytes', 'GBytes'],
        bytes = this,/*  w  ww.jav  a 2 s .c  om*/
        i;

    for (i = 0; bytes >= 1024 && i < 3; i++) {
        bytes /= 1024;
    }

    return bytes.toFixed(2) + ' ' + units[i];
};

Related

1. formatNumber()

   Number.prototype.formatNumber = function() {
     var a = Math.abs(this).toString().split('');
     v = '';
     var n = 0;
     while (a.length > 0) {
       if (n>0 && n%3 == 0)
         v = '.' + v;
       v = a.pop() + v;
       n ++;
   ...
   

2. formatNumber(c, d, t)

   Number.prototype.formatNumber = function(c, d, t){
     var n = this,
         c = isNaN(c = Math.abs(c)) ? 2 : c,
         d = d == undefined ? "." : d,
         t = t == undefined ? "," : t,
         s = n < 0 ? "-" : "",
         i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "",
         j = (j = i.length) > 3 ? j % 3 : 0;
        return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
   ...
   

3. formatNumber(c, d, t)

   Number.prototype.formatNumber = function(c, d, t) {
       var n = this, c = isNaN(c = Math.abs(c)) ? 2 : c, 
       d = d == undefined ? "," : d, 
       t = t == undefined ? "." : t, 
       s = n < 0 ? "-" : "", 
       i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", 
       j = (j = i.length) > 3 ? j % 3 : 0;
       return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
   

4. format(thousandSep, decPoint)

   Number.THOUSAND_STEP = ",";
   Number.DECIMAL_POINT = ".";
   Number.prototype.format = function(thousandSep, decPoint) {
     var decimal, str;
     thousandSep = thousandSep || Number.THOUSAND_STEP;
     decPoint = decPoint || Number.DECIMAL_POINT;
     decimal = this.toString().split(".");
     str = Math.abs(this)
       .toFixed(0)
   ...
   

5. formatAmount(c, d, t)

   Number.prototype.formatAmount=function(c, d, t) {
       var n = this, 
       c = isNaN(c = Math.abs(c)) ? 2 : c, 
       d = d == undefined ? "." : d,  
       t = t == undefined ? "," : t,  
       s = n < 0 ? "-" : "", 
       i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", 
       j = (j = i.length) > 3 ? j % 3 : 0;
       return s + "?" + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
   ...
   

6. formatComma()

   Number.prototype.formatComma = function() {
     var n = this;
     var thouSeparator = thouSeparator == undefined ? "," : thouSeparator;
     var sign = n < 0 ? "-" : "";
     var i = parseInt(n = Math.abs(+n || 0)) + "";
     var j = (j = i.length) > 3 ? j % 3 : 0;
     return sign + (j ? i.substr(0, j) + thouSeparator : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thouSeparator); 
   };
   

7. formatCustom(c, d, t)

   Number.prototype.formatCustom = function(c, d, t){
   var n = this, 
       c = isNaN(c = Math.abs(c)) ? 2 : c, 
       d = d == undefined ? "." : d, 
       t = t == undefined ? "," : t, 
       s = n < 0 ? "-" : "", 
       i = String(parseInt(n = Math.abs(Number(n) || 0).toFixed(c))), 
       j = (j = i.length) > 3 ? j % 3 : 0;
      return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
   ...
   

8. formatDecimal()

   Number.prototype.formatDecimal = function() {
     var nStr = this.toFixed(2);
     x = nStr.split('.');
     x1 = x[0];
     x2 = x.length > 1 ? '.' + x[1] : '';
     var rgx = /(\d+)(\d{3})/;
     while (rgx.test(x1)) {
       x1 = x1.replace(rgx, '$1' + ',' + '$2');
     return x1 + x2;
   };
   

9. formatHuman()

   Number.prototype.formatHuman = function() {
     var numStr   = '' + this;
     var numParts = numStr.split('.');
     var whole    = numParts[0];
     var decimal  = numParts[1] || '';
     var re = /(\d+)(\d{3})/;
     while (re.test(whole)) {
       whole = whole.replace(re, '$1' + ',' + '$2');
     return decimal.length === 0 ? whole : whole + '.' + decimal;
   };