for
while
tidyverse
ggplot2
ggplot
dplyr
nycflights13
filter()
arrange()
select()
rename()
mutate()
summarize()
NA
tibble
readr
tidyr
stringr
forcats
lubridate
magrittr
<a>
<meta>
<link>
<b>
<i>
<strong>
<p>
<h1>
<h2>
<h3>
<ul>
<ol>
<dl>
<div>
<span>
<form>
<script>
<table>
<tr>
<td>
<th>