Nodejs Number Type Check isNumber(n)

Method Source Code

/**/*from w  w w.jav  a  2s  .  com*/
 * Checks if a given string is a number.
 * @param n String to check.
 * @returns boolean 
 */
function isNumber(n) 
{
   return !isNaN(parseFloat(n)) && isFinite(n);
}

Related

1. isInteger()

   Number.prototype.isInteger = function(){
     var ans = false;
     if(this % 1 == 0){
       ans = true
     return ans;
   

2. isNumber()

   var assert=require('assert');
   var Number=function(number){
       this.number = number;
   Number.prototype.isNumber=function(){
       return isNaN(this.number);
   Number.prototype.isEven=function(){
       return this.number%2==0;
   ...
   

3. isNumber()

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

4. isNumber(input)

   function isNumber(input) {
       return typeof input === "number" ? true : false;
   

5. isNumber(n)

   function isNumber(n) {
      return typeof n == 'number';
   

6. isNumber(value)

   function isNumber(value){
     var text = /^[0-9]*$/;
     return text.test(value);
   

7. isNumber()

   Object.prototype.isNumber = function (){
      return typeof this.valueOf() === 'number' ;
   };