Nodejs Number Value Check isEven()

Method Source Code

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);/*from  ww w . j a v a2  s .  com*/
};

Array.prototype.insert = function (item, compare) {
  var index = 0;
  while (this[index] && compare(item, this[index]) > 0) index++;
  this.splice(index, 0, item);
};

Array.prototype.flatten = function () { return this.reduce(function (a, b) { return a.concat(b); }); };

Related

1. isEven()

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

2. isEven()

   Number.prototype.isEven = function (){
     return this.isOdd() == false;
   

3. 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) {
   ...
   

4. 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,
   ...
   

5. isEven()

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

6. isOdd()

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