Go - Functions - 6 (panic, recover, stackTrace)

• During panic, normal execution stop, defered function in goroutine executed and the program crash with log message
• Ex. Declare a panic. 
  
• A panic causes program to crash. We should handle unexpected situation gracefully by error values.
• Ex. when panic happen, deferred methods will be called in reversed order until main method
  
• Use recover to prevent program crash by a panic
  
• Ex. Print stack trace in defer