JSFiddle - React, Tailwind, and code Playground

JavaScript

var rolls = {
    1: [1, 1],
    2: [1, 1],
    3: [1, 1],
    4: [1, 1],
    5: [1, 1],
    6: [1, 1],
    7: [1, 1],
    8: [1, 1],
    9: [1, 1],
    10: [1, 1],
    11: [30, 100],
    12: [20, 88]
};

var sum = Object.keys(rolls).sort(function (a, b) {
    return (+a) - (+b);
}).slice(0, 10).reduce(function (p, c) {
    return p + rolls[c].reduce(function (p, c) {
        return p + c;
    }, 0);
}, 0);

alert('Sum of first 10 items is ' + sum)