You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: SonyPS4Gamepad.m
    path of file: ./repos/hebi-matlab-examples/include/util
    
    the code of the file until where you have to start completion: classdef (Sealed) SonyPS4Gamepad < handle
    % SonyPS4Gamepad wraps a joystick object in a way that is platform
    % independent an
    
function out = getNumModules(this, varargin)
            %getNumModules  returns the number of modules within a group.
            %
            %   Example
            %      % Command all-zero efforts
            %      cmd = CommandStruct()
            %      cmd.effort = zeros(1, group.getNumModules())
            %      group.send