dice.js

const factorial = require("./factorial");

const c = (n, m) => {
    return factorial(n) / (factorial(m) * factorial((n -m)));
}

// ________
const factorial = num => {
    if (num < 0) 
          return -1;
    else if (num == 0) 
        return 1;
    else {
        return (num * factorial(num - 1));
    }
}

// -------------
const c = require('./c');

const getList = number => {
    const line = number - 1;
    let accum = []

    for (let i = 0; i <= line; i++) {
        if (i < 6) {
            accum.push(c(line, i));
        }
    }

    return accum;
}

const calculateList = list => list.reduce((acc, curr) => (acc + curr), 0);

console.log(-1, getList(-1), calculateList(getList(-1)));
console.log(0, getList(0), calculateList(getList(0)));
console.log(1, getList(1), calculateList(getList(1)));
console.log(2, getList(2), calculateList(getList(2)));
console.log(3, getList(3), calculateList(getList(3)));
console.log(4, getList(4), calculateList(getList(4)));
console.log(5, getList(5), calculateList(getList(5)));
console.log(6, getList(6), calculateList(getList(6)));
console.log(7, getList(7), calculateList(getList(7)));
console.log(8, getList(8), calculateList(getList(8)));
console.log(9, getList(9), calculateList(getList(9)));
console.log(10, getList(10), calculateList(getList(10)));