> I tend to mentally divide code into roughly two types: "computational" and "plumbing". I think of the "computational" type more as a "deterministic data tran

> I tend to mentally divide code into roughly two types: "computational" and "plumbing". I think of the "computational" type more as a "deterministic data transformation" type. That applies to transformations of any data whether text, images, or the state of a machine. I think of plumbing as the movement of data without any transformation, or if a transformation occurs, it occurs at and abstracted layer that must be unit tested itself independently.