js_ questions

• in Objective-c, if structure is not initialized, what value does its member return?
• iPhone: Do I have to have images for both retina and non-retina for all image?
• In iPhone, to support bluetooth headphone, do I have to do something? [closed]
• arrayWithArray:nil returns empty array but not documented
• -viewDidUnload is not called after memory warning when xib is not used
• Does Apple reject apps that use images used in Apple's apps?
• Will observers automatically removed when observers become nil?
• in Xcode, Bundle name in info.plist doesn't change bundle name (.app file name)
• how to easily handle all errors in asynchronous functions of javascript?
• Which types of errors should stop the system, in released php web system?

js_ answers