wrap-children-in-sets.js

function wrapChildrenInSets(parentNode = null, setsOf = 2) {
    if (!parentNode) return;

    const children = [...parentNode.children];
    const divSets = [];

    const divsPerSet = setsOf;
    const numSets = Math.ceil(children.length / divsPerSet);

    for (let index = 0; index < numSets; index++) {
        const set = [...children].splice(index * divsPerSet, divsPerSet);
        const setDiv = document.createElement('div');

        set.forEach(item => {
            setDiv.appendChild(item);
        });

        divSets.push(setDiv);
    }

    divSets.forEach(set => {
        parentNode.appendChild(set);
    });
}

export default wrapChildrenInSets;