Nodejs Array Item Occurrence numberOfOccurrences(value)

Method Source Code

/*/*from w w w .j a v  a  2 s . co m*/

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

Related

1. numberOfOccurrences(search)

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

2. numberOfOccurrences(search)

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

3. 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;
   

4. 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;
   

5. 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;
   

6. numberOfOccurrences(values)

   Array.prototype.numberOfOccurrences = function(values) {
   var tracker = 0;
       for(var i = 0; i < this.length; i++)
           if (this[i]== values){
               tracker++;
       console.log(tracker);
   ...