[empty objects] #JavaScript

snippet.js

/**
 * TEST DATA
 */
var testData = [{}, {a:1}, new RegExp(), [], Object.create(null), [undefined]];

/**
 * Check if param is Object?
 * @param {*} o Checks value.
 * @return {boolean}
 */
var isObject = function(o) {
  return o === Object(o);
};
/**
 * Check if param is Array?
 * @param {*} o Checks value.
 * @return {boolean}
 */
var isArray = Array.isArray || function(o) {
  return ({}).toString.call(o) == '[object Array]';
};
/**
 * Check if param is EmptyObject?
 * @param {*} o Checks value.
 * @return {boolean}
 */
var isEmptyObject = function (o) {
  if (!isObject(o) || isArray(o)) return false;
  return Object.keys ? !Object.keys(o).length : (function (o) {
    for (var k in o) if (o.hasOwnProperty(k)) return false;
    return true;
  })(o)
};


/**
 * RUN TESTS
 */
testData.forEach(function (item) {
  console.log(isEmptyObject(item));
});