Joe C questions

• Can we use addOptional and addParameter together?
• How to pass methods of JS objects?
• Does each QT widget have a 'show' signal?
• Will MATLAB 'move' or ''copy return value?
• Does MATLAB have an exit event?
• How to learn Just-in-Time compilation? [closed]
• Should MediaPlayer.start() also be a new thread?
• lldb cannot print values in debug code
• Can .emacs read environment variables?
• How to get the substring that contains the first N unicode characters in Java

Joe C answers