sexAndDrugs.js

const propertyActions = [
  {
    name: 'body',
    check: arg => typeof arg === 'string',
  },
  {
    name: 'children',
    check: arg => arg instanceof Array,
  },
  {
    name: 'attributes',
    check: arg => arg instanceof Object,
  },
];

const getPropertyAction = arg => _.find(propertyActions, ({ check }) => check(arg));

const buildAttrString = attrs =>
  Object.keys(attrs).map(key => ` ${key}="${attrs[key]}"`).join('');

const buildHtml = (data) => {
  const [first, ...rest] = data;
  const root = {
    name: first,
    attributes: {},
    body: '',
    children: [],
  };
  const tag = rest
    .reduce((acc, arg) => {
      const { name } = getPropertyAction(arg);
      return { ...acc, [name]: arg };
    }, root);

  return [`<${tag.name}${buildAttrString(tag.attributes)}>`,
    `${tag.body}${tag.children.map(buildHtml).join('')}`,
    `</${tag.name}>`,
  ].join('');
};