So at this point we have shown people how to write their own R code and then to wrap it in into functions. And then, this is the step where we show them how to wrap those function into packages. >> Yeah, so the bottom line I think is, if you want people to actually use your code, it's gotta be in a package. Sending them a script or sending them some file that has a bunch of functions is fine. But it's not organized, there's not necessarily any documentation, there's not necessarily a tutorial of explaining how to use all these things. And so, a package is really just a mechanism for organizing your code, organizing your documentation, explaining to people how to use it. And making it really kind of friendly. >> Yeah. >> And so, it's really more about the user, and kind of providing some of the niceties that users need to kind of learn how to use your code. >> I would agree. I also think that the process of writing the documentation and putting functions together helps organize the logic for the groups of functions you're creating. >> Right, I think it also helps, you to think about what are the functions that users need and what are the functions that are just kind of in support of running the code. And so, it's kind of a natural extension of writing a function itself. Originally we started out with here's some code and then we kind of abstracted that to say here's a function and here the inputs and the outputs. And now the packages kind of natural next level where you talk about here are bunch of functions. Here, the functions that kind of like the ones that you want to call, that you need to do to accomplish specific task. >> Right, and then once you've written a package often you'll want to share it. So we're going to talk some of this about how to use GitHub to share your package and to check on other people's packages and pull them into you. >> Yeah and I think another thing were going to talk about is quality control, which is really important if you want to have a lot people using your package and to kind of maintain the quality and make that the code is always working. So we're going to talk about testing and kind of continuous integration for maintaining your packages. >> Yeah, because this builds on writing code and wrapping the code into functions this is probably going to be most comfortable, I would say for somebody who's already taken the first two courses in this specialization. >> Yeah, definitely. >> Yeah. I'm so excited the people are interested in this topic. And we're really excited that we're getting the chance to teach you how to build R packages. >> Yeah, I mean it's a really important skill, and I think that I'm just very excited to see what you can build.
