> you have no idea what invariant or structure is required for the task In my experience, in general, if you don't already have an idea, you should probably be

> you have no idea what invariant or structure is required for the task In my experience, in general, if you don't already have an idea, you should probably be spending the up-front time thinking about it. If we're talking React/Redux, then carefully thinking through both data representation and what goes into components' properties/states helps a lot for designing a clean and understandable structure.