function baseFunctions(object, props) {
      return arrayFilter(props, function(key) {
        return isFunction(object[key]);
      });
    }
The base implementation of `_.functions` which creates an array of
`object` function property names filtered from `props`.

@private
@param {Object} object The object to inspect.
@param {Array} props The property names to filter.
@returns {Array} Returns the function names.