Nodejs Number Value Check isNumber()

Method Source Code

String.prototype.isNumber = function(){
  var pattern=/^[+\-]?\d+(.\d+)?$/;
  flag=pattern.test(this);/*from  w w  w.  ja  v  a 2 s.  c o  m*/
  if(flag) return true;
  return false;
}

Related

1. isBetween(min, max, inclusive)

   Number.prototype.isBetween = function (min, max, inclusive) {
     return inclusive
       ? this >= min && this <= max
       : this > min && this < max;
   };
   

2. isBetweenisBetween(a, b)

   Number.prototype.isBetween = function isBetween(a, b) {
     if(a <= this) {
       return this <= b;
     return this >= b;
   

3. even()

   Number.prototype.even = function(){
       return (this % 2 === 0);
   };
   

4. 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)
   ...
   

5. isNumber()

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

6. isNumber()

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

7. isNumber()

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

8. isNumber()

   String.prototype.isNumber = function()
     try
       var value = this.toString();
       value = value.replace(",","");
         if (parseFloat(value)!= value)
           return false;
         else
   ...
   

9. isNumeric()

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