createNodeList

createNodeList.js

/**
 * Creates a NodeList from an array
 *
 * @param elements {Array} - array of elements from the same document
 * @throws {TypeError} - if elements are from different documents
 *
 * @returns {NodeList}
 */

function createNodeList(elements) {

    var nodeList, ownerDocument, firstElement, klass;

    // temporary class name
    klass = "cnl__" + parseInt(1000000 * Math.random(), 10).toString(16);

    // force elements to be an array
    elements = Array.prototype.slice.call(elements);

    firstElement = elements[0];
    ownerDocument = firstElement.ownerDocument;

    // make sure the elements come from the same document
    if (!elements.every(function (element) {
        return element.ownerDocument === ownerDocument;
    })) {
        throw new TypeError("Can't create a NodeList from elements from different documents!");
    }

    // add a temporary class to each of the elements
    elements.forEach(function (element) {
        element.classList.add(klass);
    });

    // find the elements with the temporary class
    // querySelectorAll returns a static NodeList
    nodeList = ownerDocument.querySelectorAll("." + klass);

    // remove the temporary class
    Array.forEach(nodeList, function (element) {
        element.classList.remove(klass);
    });

    return nodeList;
}

Ok, so it only works with elements, won't work with TextNodes, comments and stuff like that...