How to print frequency count of element in the array ?

The FrequencyCount function count how many times each element appear in the array. It creates empty object freq, iterate through the array. 

Program in JavaScript: 

Javascript Program :

function frequencyCount(arr){

  let freq={};

  for(let i=0;i<arr.length;i++)

  {

    if(freq[arr[i]])

    {

      freq[arr[i]]+= 1;

    }

    else{

      freq[arr[i]]=1;

    }

  }

  return freq;

}

console.log(frequencyCount([1,2,3,1,2,3]));

Output: {"1":2,"2":2,"3":2}