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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang="">
<head>
<title>Touring tidyverse</title>
<meta charset="utf-8" />
<link href="libs/remark-css/default.css" rel="stylesheet" />
<link href="libs/remark-css/default-fonts.css" rel="stylesheet" />
<link href="libs/countdown/countdown.css" rel="stylesheet" />
<script src="libs/countdown/countdown.js"></script>
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<textarea id="source">
class: center, middle, inverse, title-slide
# Touring tidyverse
## purrr
---
background-image: url(https://raw.githubusercontent.com/tidyverse/purrr/master/man/figures/logo.png)
background-size: 100px
background-position: 90% 6%
# purrr
is a "...complete and consistent functional programming toolkit for R". It draws inspiration from multiple languages (Haskell, Scala, Javascript, `rlist` package). From vignette:
> However, the goal of purrr is not to try and simulate a purer functional programming language in R; we don’t want to implement a second-class version of Haskell in R. The goal is to give you similar expressiveness to an FP language, while allowing you to write code that looks and works like R.
---
# Why purrr
1. API responses (JSON, XML or any list-like alternatives).
2. Make lists less 👻.
3. Efficient abstraction over `for` loops.
4. Putting all `*apply` functions from base R into more principled framework.
5. Gateway drug to functional programming and all the goodies to go along with it (e.g., parallel programming).
6. Split-Apply-Combine paradigm.
7. List-columns.
8. Plays nicely with pipe.
---
# Initial commit of purrr
First commit: `2014-11-30 00:33` by Hadley Wickham.
---
# Current state
1. Current version - 0.3.2.
1. https://github.com/tidyverse/purrr
1. Developed by __Lionel Henry__, Hadley Wickham.
1. 1000+ commits by 62 contributors.
---
background-image: url(https://raw.githubusercontent.com/tidyverse/purrr/master/man/figures/logo.png)
background-size: 100px
background-position: 90% 6%
# purrr
Covering:
1. Working with iteration in principled and safe manner.
1. ~~Functional programming.~~
1. ~~Adverbs and mappers.~~
1. ~~Utilities for working with lists.~~
```
## [1] 177
```
---
# Mapping
Following slides are from the Charlotte Wickham workshop that you can download here:
<a href="https://www.dropbox.com/sh/062xjv35izc2a92/AAAnC-nzToR1rPekDZipRJSLa?dl=0">bit.ly/purrr-rstudioconf</a>
---
background-image: url(https://raw.githubusercontent.com/romatik/touring_the_tidyverse/master/img/map.png)
background-size: 100%
# map
---
background-image: url(https://raw.githubusercontent.com/romatik/touring_the_tidyverse/master/img/map2.png)
background-size: 100%
# map2
---
background-image: url(https://raw.githubusercontent.com/romatik/touring_the_tidyverse/master/img/pmap.png)
background-size: 100%
# pmap
---
background-image: url(https://raw.githubusercontent.com/romatik/touring_the_tidyverse/master/img/walk.png)
background-size: 100%
# walk
---
background-image: url(https://raw.githubusercontent.com/romatik/touring_the_tidyverse/master/img/invoke_map.png)
background-size: 100%
# ~~invoke_map~~ -> rlang::exec
---
<div class="countdown blink-colon noupdate-30" id="timer_5d02a166" style="top:0;right:0;bottom:0;left:0;margin:5%;padding:20%;font-size:8em;line-height:1.25;" data-warnwhen="0">
<code class="countdown-time"><span class="countdown-digits minutes">03</span><span class="countdown-digits colon">:</span><span class="countdown-digits seconds">00</span></code>
</div>
---
# Resources
1. `purrr` tutorial by Jenny Brian - https://jennybc.github.io/purrr-tutorial/index.html
1. RStudio cheatsheet - https://github.com/rstudio/cheatsheets/blob/master/purrr.pdf
1. Parallel processing with `purrr` and `future` - https://www.jottr.org/2017/06/05/many-faced-future/ (also see https://github.com/DavisVaughan/furrr)
1. `purrr` workshop by Charlotte Wickham - https://www.dropbox.com/sh/062xjv35izc2a92/AAAnC-nzToR1rPekDZipRJSLa?dl=0
1. "Master the `tidyverse`" by Garett Grolemund - https://github.com/rstudio-education/master-the-tidyverse/.
1. `purrr::partial` example by Tyler Bradly - https://tbradley1013.github.io/2018/10/01/calculating-quantiles-for-groups-with-dplyr-summarize-and-purrr-partial/
</textarea>
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