Nodejs Number Type Check isNumber()

Method Source Code

/**// w w  w  . j  a  v a2  s  .  co m
 * Created on 1/14/2015.
 */
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;
}
Number.prototype.isOdd=function(){
    return this.number%2!=0;
}

var evenNumber=new Number(12);
console.log("Is number even? "+evenNumber.isEven());

var oddNumber=new Number(13);
console.log("Is number odd? "+isNaN(oddNumber));

var strangeNumber=new Number("strange");

//verification through unit test
assert.equal(evenNumber.isEven(), true);
assert.equal(oddNumber.isOdd(), true);
assert.equal(strangeNumber.isNumber(), true);

Related

1. isInt()

   Number.prototype.isInt = function() {
     return parseFloat(this) == parseInt(this, 10) && !isNaN(this);
   };
   

2. isInteger()

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

3. isInteger()

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

4. isInteger()

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

5. isNumber()

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

6. isNumber(input)

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

7. isNumber(n)

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

8. isNumber(n)

   function isNumber(n) 
     return !isNaN(parseFloat(n)) && isFinite(n);