Nodejs Number Value Check isNumber()

Method Source Code

String.prototype.isNumber = function()
{
   try/*w  w w . j a  v a  2  s . c o m*/
   {
      var value = this.toString();

      value = value.replace(",","");

       if (parseFloat(value)!= value)
          return false;
       else
          return true;
   }
   catch (err)
   {
      return false;
   }
};

Related

1. even()

   var puts = require("sys").puts;
   Number.square = function(n) {
     return n * n
   Number.even = function(n) {
     return n % 2 == 0
   Number.odd = function(n) {
     return !this.even(n)
   ...
   

2. isNumber()

   String.prototype.isNumber = function(){
     return !isNaN(this);
   };
   

3. isNumber()

   String.prototype.isNumber = function(){
     var pattern=/^[+\-]?\d+(.\d+)?$/;
     flag=pattern.test(this);
     if(flag) return true;
     return false;
   

4. isNumber()

   String.prototype.isNumber = function (){
       var str = this;
       return !isNaN(str);
   

5. isNumber()

   String.prototype.isNumber = function()
     return (/^\d+$/.test(this.Trim()));
   

6. isNumeric()

   String.prototype.isNumeric = function(){
       return !isNaN(parseFloat(this)) && isFinite(this);
   

7. isNumeric()

   String.prototype.isNumeric = function() {
     return !isNaN(parseFloat(this)) && isFinite(this);
   };
   

8. isNumeric()

   String.prototype.isNumeric = function() {
     return !isNaN(parseFloat(this)) && isFinite(this);
   };
   

9. isNumeric()

   String.prototype.isNumeric = function() {
       var tmpFloat = parseFloat(this);
       if (isNaN(tmpFloat))
           return false;
       var tmpLen = this.length - tmpFloat.toString().length;
       return tmpFloat + "0".Repeat(tmpLen) == this;