roll two six-sided dice a million times

roll_dice.ts

// https://mathworld.wolfram.com/Dice.html

const DICE  = 2;
const SIDES = 6;
const ROLLS = 1e6;

// init count
const count: { [sum: number]: number } = {};
for (let i = DICE; i <= DICE * SIDES; i++) {
    count[i] = 0;
}

// roll dice
for (let i = 0; i < ROLLS; i++) {
    let sum = 0;
    for (let j = 0; j < DICE; j++) {
        sum += 1 + ~~(Math.random() * SIDES);
    }
    count[sum]++;
}

// log sum distribution
Object
    .keys(count)
    .forEach(
        v => console.log(`${v}: ${(count[v] / ROLLS) * 100}%`)
    )