I don’t mind repeating something as long as I write it in a style that could become a function in a straightforward way. Seems like the first time you have to

I don’t mind repeating something as long as I write it in a style that could become a function in a straightforward way. Seems like the first time you have to change something, you realize it applies to one case and not the other. The more important thing is that the repeated/common parts are obvious. For example, if you reuse the same logic in a couple places, where the only difference is some specific variable, it should be written as a block with alias variables at the top. That way, two different cases look literally the same (except for a couple assignments at the top).