Group array elemens by elements size

group-array.js

function groupArray(array = [], size = 10) {
    const res = array.reduce((p, c) => {
        if (p[p.length - 1].length == size) {
            p.push([]);
        }

        p[p.length - 1].push(c);
        return p;
    }, [[]]);

    return res;
}

module.exports = groupArray;