Nodejs Number Value Check isEven()

Method Source Code

Number.prototype.isEven = function () {
    if (this % 2 === 0) {
        return true;
    } else return false;
};

function sumFibs(num) {

    //generate the Fib sequence up to the num

    var sumFibArr;
    var fibArray = fibArrayGenerator(num);

    fibArray = fibArray.filter(function (value) {
        if (value.isEven()) return false;
        else return true;
    });/*from w w w . j  a  v a  2  s .c o  m*/

    sumFibArr = fibArray.reduce(function(total, num) {return total + num;});

    return sumFibArr;
}

console.log(sumFibs(3978423455));

function fibArrayGenerator(num) {

    var fibArray = [1];
    var currentFibValue = 1;
    var fibPointer = 0;

    while (currentFibValue <= num) {

        fibArray.push(currentFibValue);
        currentFibValue += fibArray[fibPointer];
        fibPointer++;
    }

    return fibArray;

}

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 () { 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);
   };
   ...
   

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);
   

7. isOdd()

   function isOdd(num) {
     if (typeof num === 'number') {  
       return ((num % 2) === 1) || ((num % 2) === -1) ? true : false;
     else {
       throw 'Not a number';
   console.log(isOdd(3)); 
   ...