Nodejs Number Value Check isOdd()

Method Source Code

function isOdd(num) {
   if (typeof num === 'number') {   
      return ((num % 2) === 1) || ((num % 2) === -1) ? true : false;
   }/*from  ww w. j  a va  2s .  c  o m*/
   else {
      throw 'Not a number';
   }
}

console.log(isOdd(3)); // true
console.log(isOdd(2));  // false
console.log(isOdd(-3));  // true
console.log(isOdd(2.1)); // false
console.log(isOdd('3')); // Uncaught Not a number

Number.prototype.isOdd = function() {
      return ((this % 2) === 1) || ((this % 2) === -1) ? true : false;
}


var a = -3;
console.log(a.isOdd());  // true

a = 2.1;
console.log(a.isOdd()); // false

console.log((3).isOdd()); // true
console.log((2).isOdd());  // false

a = '3';
console.log(a.isOdd()); // Uncaught Not a number

Related

1. isEven()

   Number.prototype.isEven = function () { return (this % 2) === 0; }; 
   Number.prototype.isOdd = function () { return Math.abs(this % 2) === 1; };
   Array.prototype.isEmpty = function () { return this.length === 0; };
   Array.prototype.hasItem = function (item) { return this.indexOf(item) >= 0; };
   Array.prototype.remove = function (item) {
     var index = this.indexOf(item);
     if (index >= 0)
       this.splice(index, 1);
   };
   ...
   

2. isEven()

   Number.prototype.isEven = function () {
       if (this % 2 === 0) {
           return true;
       } else return false;
   };
   function sumFibs(num) {
       var sumFibArr;
       var fibArray = fibArrayGenerator(num);
       fibArray = fibArray.filter(function (value) {
   ...
   

3. isEven()

   window.log = console.log;
   function fib(num) {
     return (num < 3) ? num : fib(num - 1) + fib(num - 2);
   Number.prototype.isEven = function() {
     return (this % 2 === 0) ? true : false;
   };
   function fibSum() {
     var i = 1,
   ...
   

4. isEven()

   Number.prototype.isEven = function() {
       return !(this % 2);
   

5. isOdd()

   Number.prototype.isOdd = function () {
     return new Boolean(this.valueOf()&1);
   

6. isOdd()

   Number.prototype.isOdd = function() {
       return !!(this % 2);
   

7. odd()

   Number.prototype.odd = function () {
     return (this % 2 == 1)
   

8. odd()

   Number.prototype.odd = function(){
     return ( ( this % 2 ) == 1 )
   

9. isBetween(l,h)

   Number.prototype.isBetween = function(l,h){
     return (this >= l.val() && this <= h.val());