Nodejs Array Check isInt()

Method Source Code

// //Implement the following custom Array methods:
// even//[1,2,3,4,5].even() should return [2,4];
// odd // [1,2,3,4,5].odd() should return [1,3,5];
// under // [1,2,3,4,5].under(4) should return [1,2,3];
// over // [1,2,3,4,5].over(4) should return [5];
// inRange // [1,2,3,4,5].inRange(1,3) should return [1,2,3];

// //They should also be chainable
// //Filters should only accept integer values from an array

//Solution/* ww w.j  a  v a 2 s  . c  om*/

Array.prototype.isInt = function (){
   return this.filter(function(n){ return (typeof(n) === 'number') && (n%1 === 0)})
};

Array.prototype.even = function (){
   return this.isInt().filter(function(n){ return n%2 === 0})
};

Array.prototype.odd = function (){
   return this.isInt().filter(function(n){ return n%2 !== 0})
};

Array.prototype.under = function (x){
   return this.isInt().filter(function(n){ return n < x})
};

Array.prototype.over = function (x){
   return this.isInt().filter(function(n){ return n > x})
};

Array.prototype.inRange = function (min, max){
   return this.isInt().filter(function(n){ return n >= min && n <= max})
};

Related

1. isArray(obj)

   Array.isArray = Array.isArray || function (obj) {
     return {}.call(obj) === '[object Array]';
   };
   

2. isBlank()

   function proxy(func, context, args) {
       return function () {
           return func.apply(context, args);
   Array.prototype.isBlank = function () {
       return !this.length;
   };
   

3. isCharPresent(charSearch)

   Array.prototype.isCharPresent = function(charSearch) {
     var arr = this;
     var result = [];
     var testingStr = '';
     if (charSearch.length > 1) {
       return "You're searching for more than one char";
     for (var i = 0; i < this.length; i++) {
       if (arr[i].indexOf(charSearch) === -1) {
   ...
   

4. isDefined(key)

   Array.prototype.isDefined = function (key) {
       return this.filter(c => {
           if (key) return c[key];
           return !!c;
       });
   

5. isDistinct()

   Array.prototype.isDistinct = function() {
     this.sort();
     for (var i = 1; i < this.length; i++) {
       if (this[i - 1] == this[i])
         return false;
     return true;
   };
   

6. isLastIndex(index)

   Array.prototype.isLastIndex = function(index) {
     return index == (this.length - 1);
   

7. isMember(b)

   Array.prototype.isMember = function (b) {
     return this.some(function (i) {
       return this == i
     }, b);
   

8. isNFromLastIndex(index, n)

   Array.prototype.isNFromLastIndex = function(index, n) {
     return (this.length - 1 - n) == index;
   

9. isNothing()

   Array.prototype.isNothing = function() {
     return this.length === 0;
   };