Type checking is an important property that is used extensively in Flash ActionScripting. It can occur either during compIle tIme or during run time. Flash ActionScripting suport both run and compile time type checking. The type checkmg IS. perform:d with the help of a special compiler mode called strict mode m which type checking is done both at compile and run time On the other hand , in the case of standard mode, type checking occurs only at run time.