Using a counter Obj

counterObj.js

var arr = [1, 1, 3, 4, 6, 4, 5, 7, 89, 90, 0, 5, 32, 1, 1, 1]

var mostOccurances = function(arr){
  var counterObj = {}
  
  for(var i=0; i<arr.length; i++){
    var num = arr[i]
    if(counterObj[num] == undefined){
      counterObj[num] = 1
    } else {
      counterObj[num] = counterObj[num] + 1
    }
  }
  return counterObj
}

console.log(mostOccurances(arr))