Nodejs Array Count count(n)

Method Source Code

Array.prototype.count = function(n) {
  var count = 0;/*from w ww.j  a  v a  2 s. c o  m*/
  for (var i = 0; i < this.length; i++) {
    if (this[i] == n) count++;
  }
  return count;
}

function primeFactors(n) {
  var f = [];
  var d = 2;
  while (n > 1) {
    while (n%d==0) {
      f.push(d);
      n = n/d;
    }
    d++;
  }
  return f;
}

function smallestDivTo(x) {
  var factors = [];
  for (var i = 2; i <= x; i++) {
    var f = primeFactors(i);
    for (var j = 0; j < f.length; j++) {
      if (!factors[f[j]] || (f.count(f[j]) > factors[f[j]])) factors[f[j]] = f.count(f[j]);
    }
  }
  var result = 1;
  for (var i = 0; i < factors.length; i++) {
    if (factors[i]) result *= Math.pow(i, factors[i]);
  }
  return result;
}

test("smallestDivTo", function() {
  equal(smallestDivTo(10), 2520);
  equal(smallestDivTo(20), 232792560);
});

Related

1. count()

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

2. count()

   Array.prototype.count = function () {
       return this.length;
   let numbers = [1,2,3,4];
   let moreNumbers = new Array(1,2,3,4);
   console.log(numbers.count());
   console.log(moreNumbers.count());
   

3. 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;
   

4. 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(" ");
   ...
   

5. 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;
   ...
   

6. count(value)

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

7. count(value)

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

8. countCattle( kind )

   Array.prototype.countCattle = function ( kind ){
     var numKind = 0;
     for(var i = 0; i<this.length; i++){
       if(this[i].type == kind){
         numKind++;
     return numKind;
   };
   ...
   

9. countCattle(cattle)

   Array.prototype.countCattle = function(cattle){
     var number = 0;
     for(var i = 0; i < this.length; i ++){
       if(this[i].type == cattle){
         number ++ ;
     return number;
   };
   ...