Functions

Writing a Family of Functions for Related Tasks

1. Explain why you might want to write a collection of functions to perform tasks related to a single object.
2. Describe good coding conventions for writing functions for:
   • the same kind of object
   • the same kind of task

Sourcing a File

1. Compare and contrast an R Markdown file and an R script.
2. Create an R script in RStudio.
3. Give the file suffix for R Markdown files and R scripts.
4. Source functions from an R script using source().

Function Documentation

1. Explain why you should always (yes, always) write documentation for a function you write.
2. State the three things (at the very least) you should document when writing a function header.
3. Use roxygen-style formatting (that’s the #' stuff) to write header comments for a given function.