Nodejs Array Item Occurrence numberOfOccurrences(values)

Method Source Code

/* numberOfOccurrences //from w w w .  j  ava2 s.  c  om

The numberOfOccurrences function must return the number of occurrences of an element in an array.

var arr = [0,1,2,2,3];
arr.numberOfOccurrences(0) === 1;
arr.numberOfOccurrences(4) === 0;
arr.numberOfOccurrences(2) === 2;
arr.numberOfOccurrences("a") === 0;


*/

Array.prototype.numberOfOccurrences = function(values) {

var tracker = 0;

    for(var i = 0; i < this.length; i++)
    {
        if (this[i]== values){

            tracker++;
        }
    }
    
    console.log(tracker);
};


var arr = [0,1,2,2,3];
arr.numberOfOccurrences(0);
arr.numberOfOccurrences(4);
arr.numberOfOccurrences(2);
arr.numberOfOccurrences("a");

Related

1. numberOfOccurrences(search)

   Array.prototype.numberOfOccurrences = function(search) {
     return this.filter( function(num){ return search === num } ).length;
   

2. numberOfOccurrences(target)

   Array.prototype.numberOfOccurrences = function(target) {
     for(var i =0;i<this.length;i++){
       var x = this.filter(function(b){return b === target}).length
     return x;
   

3. numberOfOccurrences(val)

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

4. numberOfOccurrences(val)

   Array.prototype.numberOfOccurrences = function(val) {
     var count = 0;
     for(var i=0;i<this.length;i++){
       if(val === this[i]){
         count += 1;
     return count;
   

5. numberOfOccurrences(value)

   Array.prototype.numberOfOccurrences = function(value) {
     var count = 0;
     this.forEach(function(elem, index){
       if(elem === value){
         count++;
     });
     return count;
   };
   ...