Nodejs Array Count countCattle(kind)

Method Source Code

Array.prototype.countCattle = function (kind) {
  var numKind = 0;

  for (var i = 0; i < this.length; i++) {
    if (this[i].type == kind) {
      numKind++/* w ww.jav a 2  s . c om*/
    }
  }

  return numKind
}

var canyonCows = [
  { name: "Bessie", type: 'cow', hadCalf: 'Burt'},
  { name: "Bessie", type: 'bull', hadCalf: 'Burt'},
  { name: "Bessie", type: 'cow', hadCalf: 'Burt'},
  { name: "Bessie", type: 'cow', hadCalf: 'Burt'},
  { name: "Bessie", type: 'calf', hadCalf: null},
]

console.log(canyonCows.countCattle('cow'))

Related

1. 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;
   };
   ...
   

2. 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;
   };
   ...
   

3. 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;
   };
   ...
   

4. 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;
   };
   ...
   

5. 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;
   };
   ...
   

6. countCattle(kind)

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

7. calculateCount()

   Array.prototype.calculateCount = function() {
       return this.length;
   };
   var a = ["1", "2"];
   var count = a.calculateCount();
   console.log(count);
   

8. countForBreeding()

   Array.prototype.countForBreeding = function() {
     var numToBreed = 0;
     for (var i = 0; i < this.length; i++) {
       if (this[i].noCalvesYet()) {
         numToBreed++;
     return numToBreed;
   };
   ...
   

9. countItem(item)

   Array.prototype.countItem = function (item) {
           return this.filter(function (i) {
               return i === item
           }).length;
   };