Nodejs Array Item Occurrence numberOfOccurrences(item)

Method Source Code

// http://www.codewars.com/kata/number-of-occurrences/javascript

Array.prototype.numberOfOccurrences = function(item) {
var drr = []; // Empty array
var i = 0 ;/*from   www.j  av a2  s  .  co  m*/
   for(i = 0 ; i < this.length ; i++) {
       if(item=== this[i]){
             drr.push(this[i]); // looping through the item and pushing the same number of occurrences into the empty array.
       }
   }
    return drr.length;

}

Related

1. numberOfOccurrences(chr)

   Array.prototype.numberOfOccurrences = function(chr) {
     return this.filter(function(x){ return x == chr; }).length;
   

2. numberOfOccurrences(desVal)

   Array.prototype.numberOfOccurrences = function(desVal) {
     var counter = 0;
     this.forEach(function(value){
       if(value === desVal){
         counter++;
     });
     return counter;
   };
   ...
   

3. numberOfOccurrences(el)

   Array.prototype.numberOfOccurrences = function (el) {
     var count = 0;
     this.forEach(function (item) {
       if (item === el) count++;
     });
     return count;
   

4. numberOfOccurrences(elem)

   Array.prototype.numberOfOccurrences = function(elem) {
     let obj = {};
     this.forEach(elem => elem in obj ? obj[elem]++ : obj[elem] = 1);
     return obj[elem] === undefined ? 0 : obj[elem]
   

5. numberOfOccurrences(i)

   Array.prototype.numberOfOccurrences = function(i) {
     var total = 0;
     this.filter(function (x) {
       if (i === x)
         total++;
     });
     return total;
   };
   var arr = [0,1,2,2,3];
   ...
   

6. numberOfOccurrences(item)

   var arr = [4, 0, 4];
   Array.prototype.numberOfOccurrences = function(item) {
     tmp = 0;
     for(var i=0; i<this.length; i++){
       if (item == this[i]) {
         tmp ++;
     console.log(tmp);
   ...
   

7. numberOfOccurrences(n)

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

8. numberOfOccurrences(num)

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

9. numberOfOccurrences(num)

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