use random numbers from 1 to 6 (dice) to simulate normal distribution in js, only for educational purposes

normaldist_simulator.js

//purpose:  use random numbers from 1 to 6 (dice) to simulate normal distribution in js, only for educational purposes
//author:   jr
//date:     27.11.2023
const min = 1, max = 6;

let getRand = (countRand = 1) => {
    let sumRand = 0;
    for (let i = 0; i < countRand; i++)
        sumRand += Math.floor(Math.random() * (max - min + 1)) + min;
    let rand = Math.round(sumRand / countRand);
    return rand;
}



//begin map1
{
    let map = new Map();
    for (let i = 0; i < 1_000_000; i++) { //oneLoop

        //only 1 random number: 
        let rand = getRand(1);

        let gotVal = map.get(rand) ?? 0;
        let newVal = gotVal + 1;
        map.set(rand, newVal);
    }
    let sum = [...map.values()].reduce((a, b) => a + b);
    let map2 = new Map([...map.entries()].sort());
    for (let [k, v] of map2) {
        console.log("map1: ", k, "  ", (v / sum * 100).toFixed(2))
    }
    console.log("-------------------------------------------------------------------------");
}


//begin map2
{
    let map = new Map();
    for (let i = 0; i < 1_000_000; i++) { 

        let rand = getRand(5); //increment 5 to other values: 8, 12, 15, 20 ...

        let gotVal = map.get(rand) ?? 0;
        let newVal = gotVal + 1;
        map.set(rand, newVal);
    }
    let sum = [...map.values()].reduce((a, b) => a + b);
    let map2 = new Map([...map.entries()].sort());
    for (let [k, v] of map2) {
        console.log("map2: ", k, "  ", (v / sum * 100).toFixed(2))
    }
    console.log("-------------------------------------------------------------------------");
}