Nodejs Array Check isDistinct()

Method Source Code

Array.prototype.isDistinct = function() {
  this.sort();/*from  ww w  .j  a v a 2s.  c o  m*/
  for (var i = 1; i < this.length; i++) {
    if (this[i - 1] == this[i])
      return false;
    }
  return true;
};

Related

1. isAllNegative()

   function maxSubArray (array) {
     var maxSoFar = 0,
         maxSum = 0;
     if (array.isAllNegative()) {
       var maxNum = Number.NEGATIVE_INFINITY;
       for (var j = 0, jLen = array.length; j < jLen; j++) {
         if (array[j] > maxNum) {
           maxNum = array[j]
       return maxNum;
     for (var i = 0, len = array.length; i < len; i++) {
       maxSoFar += array[i];
       if (maxSoFar < 0) {
         maxSoFar = 0;
       else if (maxSoFar > maxSum) {
         maxSum = maxSoFar;
     return maxSum;
   Array.prototype.isAllNegative = function () {
     for (var i = 0, len = this.length; i < len; i++) {
       if (this[i] >= 0) {
         return false;
     return true;
   var myArray = [-100,-2,-3,-4,-105,-104];
   maxSubArray(myArray);
   

2. isArray(obj)

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

3. isBlank()

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

4. 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) {
   ...
   

5. isDefined(key)

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

6. isInt()

   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})
   };
   ...
   

7. isLastIndex(index)

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

8. isMember(b)

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

9. isNFromLastIndex(index, n)

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