Welcome to this course on the functional programming aspect of purrr, a powerful toolkit for R. If you've ever wondered what the purrr description, A functional programming toolkit for R, really means, you're in the right place. Throughout this course, we will guide you through the process of harnessing the full potential of the .f in map(.x, .f) to iterate over lists, vectors, and data frames. By doing so, you will be able to write robust, clean, and easily maintainable code. In addition to learning how to write your own mappers or lambda functions, you will also gain an understanding of predicates and adverbs. These concepts will further enhance your ability to manipulate and parse results from nested lists. To solidify your understanding, we will apply this newfound knowledge to a practical use case. You will see firsthand how to extract, retain, or discard elements from a simple nested list. Furthermore, we will explore how to compose functions to manipulate and parse the results. Moreover, we will delve into integrating purrr workflow within other functions, enabling you to streamline your code and avoid unnecessary repetition. By the end of this course, you will have a comprehensive understanding of purrr's functional tools and how to effectively utilize them in your R programming projects.