这是一本online版的shiny book, 《Mastering Shiny》，按照作者Hadley Wickham（真大神也。。）的说法，将于2020年在O'reilly系列中出版
Shiny is a framework for creating web applications using R code. It is designed primarily with data scientists in mind, and to that end, you can create pretty complicated Shiny apps with no knowledge of HTML, CSS, or JavaScript
Mastering Shiny在shiny官方文档基础上做了补充，帮助shiny开发者们更好的理解shiny，使得shiny app具有更多的个性化UI，稳健的code以及更好的性能
作者归纳了几点shiny用途
- Create dashboards that track important performance indicators, and facilitate drill down into surprising results.
- Replace hundreds of pages of PDFs with interactive apps that allow the user to jump to the exact slice of the results that they care about.
- Communicate complex models to a non-technical audience with informative visualisations and interactive sensitivity analysis.
- Provide self-service data analysis for common workflows where replacing email requests with a Shiny app that allows people to upload their own data and perform standard analyses.
- Create interactive demos for teaching statistics and data science concepts that allow learners to tweak inputs and observe the downstream effects of these changes in an analysis.
这本书主要包括以下内容
- Getting started：了解shiny基本内容，例如shiny app结构，有用的UI组件以及reactive编程基础
- Shiny in action：在了解shiny基础内容前提下，进一步学习如何其他UI类型，如dashboards和gadgets；以及通过HTML/CSS来个性化调整shiny app
- Mastering reactivity：深入了解reactive编程的原理基础，从而进一步的创造新的shiny工具来解决实际问题
- Taming Shiny：学习如何测试及改进shiny app性能，如何debug以及管理app的依赖
学习Shiny前准备
知识点主要涉及到best practices for data science，R programming以及software engineering相关内容，因此推荐书籍：
用到的R packages如下：
install.packages(c(
"gapminder", "ggforce", "openintro", "shiny", "shinyFeedback",
"shinythemes", "tidyverse", "vroom", "waiter"
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