Internal variables for states

[paxer]

It would be useful to have states' own internal state variables, e.g., the variable that is available only within this state and accessible and can be mutated by all state events.

currently, this will be an error

fsm = new SnowState("walk")

fsm.add("walk", {
    _some_internal_var: 123,

        enter: function() {
            // error Variable _some_internal_var not set before reading it.
           show_debug_message(_some_internal_var)
        }

       step: function() {
           // error Variable _some_internal_var not set before reading it.
           show_debug_message(_some_internal_var)
       }

[sohomsahaun]

It is less likely for state-specific variables to be a thing in SnowState. You have to use instance variables instead.

There is a workaround though, which I highly discourage. You can declare instance variables in the enter event and use it in the state.

fsm = new SnowState("walk");
fsm.add("walk", {
       enter: function() {
           __walk_internal_var = 123;
       },
       step: function() {
           show_debug_message(__walk_internal_var);
       }
}