Older post but I think it might be beneficial to my current flow which is quickly becoming a beast.  Wondering if anyone could perhaps shed some light on the OP's limitation comment:

 

"Limitations:

The above approach will not work if you want to change the values of the constant."

 

In my current flow I am initializing several variables, both String and Integer, that will eventually be updated via Set variable actions.  Is the use of these set actions the limitation the OP is referencing in their limitation comment?

 

Thanks