/**
 * Check if argument is a HTML element.
 *
 * @param {Object} value
 * @return {Boolean}
 */
export const node = function (value) {
  return value !== undefined && value instanceof HTMLElement && value.nodeType === 1;
};

/**
 * Check if argument is a list of HTML elements.
 *
 * @param {Object} value
 * @return {Boolean}
 */
export const nodeList = function (value) {
  let type = Object.prototype.toString.call(value);

  return (
    value !== undefined &&
    (type === '[object NodeList]' || type === '[object HTMLCollection]') &&
    'length' in value &&
    (value.length === 0 || node(value[0]))
  );
};

/**
 * Check if argument is a string.
 *
 * @param {Object} value
 * @return {Boolean}
 */
export const string = function (value) {
  return typeof value === 'string' || value instanceof String;
};

/**
 * Check if argument is a function.
 *
 * @param {Object} value
 * @return {Boolean}
 */
export const fn = function (value) {
  let type = Object.prototype.toString.call(value);

  return type === '[object Function]';
};

export default {
  node,
  nodeList,
  string,
  fn,
};