stumped questions

• Setting colors for CGContextRef
• Copying an immutable string?
• Algorithm for max and min? (Objective-C)
• Objective-C operator (?) and (:)
• Trouble installing Ruby (Failed to download resource "readline--patch")
• When to use set vs willSet in Swift? [duplicate]
• JS function being called twice? [closed]
• Creating a singleton with allocWithZone:
• Difference between Icon and ImageIcon?
• System.exit(1) and return

stumped answers