♦ Action is a collection of Vb statements in QTP. It does not return any values.Function collection of Vb statements in QTP. It returns single value.
♦ We can call functions within actions but we can't call actions within functions
♦ Generally functions are saved with ".vbs" extention where as actions will save with ".mts".
♦ Every Action will have its own Datatable where as function does not.
♦ Action can have a object repository associated with it while a function can't. A function is just lines of code with some/none parameters and a single return value while an action can have more than one output parameters.
♦ Action can contains Object Repository, Data table, Active screen etc. whereas function do not have these features.
♦ Action is internal to QTP whereas Function is just lines of code with some/none parameters and a single return value.
♦ Action can/can not be resuable whereas functions are always reusable.
♦ Action Parameter have default values whereas VB script function do not have any default values.
♦ Action parameter type are byvalue only where vbscript functions can be passed byref.
♦ Action can have multiple output(returning) values whereas function can return only single value.
