day2_4.md

Day 2, Session 4

Iterating well with purrr, with Shannon Pileggi

Learning objectives

• Briefly discuss iterative techniques that do not require loops or purrr::map_ (for example, group_by, vectorized functions, etc.

• Explore lists as an object to store information of varying types and sizes; explain how to extract elements from a list.

• Apply functions from the purrr::map_ family to perform iteration as an alternative to loops.

Slides

• view slides in your web browser:

• https://rstats-wtf.github.io/wtf-purrr-slides

• wtf-closing.pdf

Exercises

• appear in the slides

Additional Resources

• Jenny Bryan purrr tutorial https://jennybc.github.io/purrr-tutorial/

• Charlotte Wickham purrr tutorial https://github.com/cwickham/purrr-tutorial

• Jenny Bryan row-oriented workflows workshop https://github.com/jennybc/row-oriented-workflows

• Advanced R by Hadley Wickham, Ch 9 Functionals https://adv-r.hadley.nz/functionals.html

• The Joy of Functional Programming (for Data Science) webinar by Hadley Wickham https://www.youtube.com/watch?v=bzUmK0Y07ck