import arrayFrom from './array-from';

/**
 * @param {NodeList} nodes
 * @param {Function} [matcher]
 * @return {Attr[]}
 */
export default function selectAttributes(nodes, matcher) {
  const attrs = arrayFrom(nodes).reduce((acc, node) => {
    if (!node.attributes) {
      return acc;
    }

    const arrayfied = arrayFrom(node.attributes);
    const matched = matcher ? arrayfied.filter(matcher) : arrayfied;
    return acc.concat(matched);
  }, []);

  return attrs;
}