Yahtzee Game First Major project attempt

Hey guys. I am trying to build a javascript game doing yahtzee. So far I am able to filter 3’s, 4’s, 5’s, etc. However, now that I’ve gotten to three of a kind. I am lost on how I should approach the problem. I would love to be able to do this with a for loop as I want to become more comfortable with for loops before moving into higher order functions. So far I’ve been programming for 6 months.

This is the class I have built for the rolling system.

class Dice {
  constructor(numOfSides){
    this.numOfSides = numOfSides; 
  } 
  roll(){
      return Math.floor(Math.random() * this.numOfSides + 1); 
  }
}

// then a way to roll 5 dice at once
let multRolls = dice =>{
  let diceRoll = new Dice(6)
  let fiveDieRoll = []
    for(let i = 0; i < dice; i++){
      fiveDieRoll.push(diceRoll.roll())
    }
    return fiveDieRoll
  }

//now for attempting to figure out some way to filter 3 of a kind(unfortunately no luck)

function filterThreeDie(x){
    let threeOfAKind = []
    let roll = multRolls(5)
    for(let i = 0; i < roll.length; i++){
      if(roll.includes(3) === x){
       threeOfAKind.push(roll[i])   
      }
    }
    return threeOfAKind
}

One way of counting occurrences in an array would be by converting to an object where keys are dice face and values are how many times this key is encountered in the array:

[1, 5, 2, 2, 3, 2] => { 1: 1, 5: 1, 2: 3, 3: 1 }