code: function store(obj, elem, key)
  {
    Array.isArray(obj) ? obj.push(elem) : (obj[key] = elem);
  }
docs: Stores provided element in the provided object or array
  
  @param   {object|array} obj - object or array to add to
  @param   {mixed} elem - element to add
  @param   {string|number} key - object's property key to add to
  @returns {void}