code: function dotOperatorFunc (attributeName, obj) {
        var func
  
        if (obj) func = obj[attributeName]
  
        if (typeof func === 'function') {
          return func.apply(obj, Array.prototype.slice.call(arguments, 2))
        }
      }
docs: Dot operator function.
  
  @param {String} attributeName
  @param {Object} obj
  @param {...} rest of arguments
  
  @returns {*} result