Nodejs Array Item Occurrence numberOfOccurrences(i)

Method Source Code

Array.prototype.numberOfOccurrences = function(i) {
  var total = 0;//from  w  w  w  . j  ava 2 s  . co  m
  this.filter(function (x) {
    if (i === x)
      total++;
  });
  return total;
};

var arr = [0,1,2,2,3];

console.log(arr.numberOfOccurrences(0));// === 1;
console.log(arr.numberOfOccurrences(4));// === 0;
console.log(arr.numberOfOccurrences(2));// === 2;
console.log(arr.numberOfOccurrences("a"));// === 0;

// Top solution:
//
// Array.prototype.numberOfOccurrences = function(n) {
//   return this.filter(function(x){return x==n;}).length;
// }
//

Related

1. numberOfOccurrences(arr)

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

2. numberOfOccurrences(chr)

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

3. numberOfOccurrences(desVal)

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

4. numberOfOccurrences(el)

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

5. 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]
   

6. numberOfOccurrences(item)

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

7. 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);
   ...
   

8. numberOfOccurrences(n)

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

9. numberOfOccurrences(num)

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