Nodejs Array Count count(value)

Method Source Code

// Test that a warning will occur when modifying a native object's prototype.

Array.prototype.count = function (value) {
   var count = 0, i;
   for (i = 0; i < this.length; ++i) {
      if (this[i] === value) {
         ++count;/*from ww w  . ja va 2 s  .  c o  m*/
      }
   }
   return count;
};

Boolean.prototype = {
   sup: function () {}
};

NonArray.prototype.random = function () {
   return 4;
};

Related

1. count()

   Array.prototype.count = function () {
       return this.length;
   let numbers = [1,2,3,4];
   let moreNumbers = new Array(1,2,3,4);
   console.log(numbers.count());
   console.log(moreNumbers.count());
   

2. count()

   Array.prototype.count = function () {
       var temp = {};
       for (var i = 0; i < this.length; i++) {
           if (!(temp[this[i]])) {
               temp[this[i]] = 1;
           } else {
               temp[this[i]]++;
       return temp;
   

3. count()

   function letterCapitalize(string) {
       var stringArray = string.split(" ");
       var sentence = stringArray.map(function(word) {
           var firstLetter = word[0];
           var otherLetters = word.slice(1);
           var capFirst = firstLetter.toUpperCase();
           return capFirst + otherLetters;
       })
       return sentence.join(" ");
   ...
   

4. count(filter)

   Array.prototype.count = function(filter)
     var ct = 0;
     for (var i = 0; i< this.length; i++) {
       if(filter(this[i])){
         ct++;
     return ct;
   ...
   

5. count(n)

   Array.prototype.count = function(n) {
     var count = 0;
     for (var i = 0; i < this.length; i++) {
       if (this[i] == n) count++;
     return count;
   function primeFactors(n) {
     var f = [];
   ...
   

6. count(value)

   Array.prototype.count = function (value) {
     var count = 0, i;
     for (i = 0; i < this.length; ++i) {
       if (this[i] === value) {
         ++count;
     return count;
   };
   ...
   

7. countCattle( kind )

   Array.prototype.countCattle = function ( kind ){
     var numKind = 0;
     for(var i = 0; i<this.length; i++){
       if(this[i].type == kind){
         numKind++;
     return numKind;
   };
   ...
   

8. countCattle(cattle)

   Array.prototype.countCattle = function(cattle){
     var number = 0;
     for(var i = 0; i < this.length; i ++){
       if(this[i].type == cattle){
         number ++ ;
     return number;
   };
   ...
   

9. countCattle(kind)

   Array.prototype.countCattle = function(kind) {
     var numKind = 0;
     for (var i = 0; i<this.length; i++) {
       if (this.type == kind){
         numKind++;
     return numKind;
   };
   ...