Yeah, and most of SOLID are just good ideas in general in software design, regardless of whether you're using OO. Write objects/programs/functions/libraries/int

Yeah, and most of SOLID are just good ideas in general in software design, regardless of whether you're using OO. Write objects/programs/functions/libraries/interfaces that do one thing. Depend on an interface, not an implementation. That's the S and the D. L becomes irrelevent outside OO, and the sorts of things you would do with L you can do by instead loading a different library for D, or passing in the correct implementation for the situation, in a manner akin to DI. I is really just a more specific restatement of S, and O falls out of D easily, so long as you design your functions and libraries well. So in short, the idea of SOLID is to write units that have a single, small responsibility, split large units into smaller ones, make the interface abstracted from the implementation, and ensure that it is easy to write alternate implementations of a given interface as necessary. Those aren't OO ideas, those are just good design ideas.