Nodejs Array Count count()

Method Source Code

Array.prototype.count = function () {
    return this.length;
}
let numbers = [1,2,3,4];//from   w  w  w  . j  a v a 2 s. c o m
let moreNumbers = new Array(1,2,3,4);


console.log(numbers.count());
console.log(moreNumbers.count());

Related

1. count()

   Array.prototype.count = function(){
       return this.length;
   };
   

2. count()

   Array.prototype.count = function () {
       var temp = {};
       for (var i = 0; i < this.length; i++) {
           if (!(temp[this[i]])) {
               temp[this[i]] = 1;
           } else {
               temp[this[i]]++;
       return temp;
   

3. count()

   function letterCapitalize(string) {
       var stringArray = string.split(" ");
       var sentence = stringArray.map(function(word) {
           var firstLetter = word[0];
           var otherLetters = word.slice(1);
           var capFirst = firstLetter.toUpperCase();
           return capFirst + otherLetters;
       })
       return sentence.join(" ");
   ...
   

4. count(filter)

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

5. count(n)

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