code: function validateSaveLoadParameters(that, method, file, cb, options) {
          if ('string' !== typeof file || file.trim() === '') {
              that.throwErr('TypeError', method, 'file must be ' +
                            'a non-empty string');
          }
          if (cb && 'function' !== typeof cb) {
              that.throwErr('TypeError', method, 'cb must be function ' +
                            'or undefined');
          }
          if (options && 'object' !== typeof options) {
              that.throwErr('TypeError', method, 'options must be object ' +
                            'or undefined');
          }
      }
docs: ### validateSaveLoadParameters
  
  Validates the parameters of a call to save, saveSync, load, loadSync
  
  @param {NDDB} that The reference to the current instance
  @param {string} method The name of the method invoking validation
  @param {string} file The file parameter
  @param {function} cb The callback parameter
  @param {object} The options parameter