Select direct descendants with the child combinator
By now, you surely know how to select elements by type, class, or ID. However, there are cases where these selectors won't work, for example, if you only want to extract direct descendants of the top ul
element. For that, you will use the child combinator (>
) introduced in the video.
Here, your goal is to scrape a list (contained in the languages_html
document) of all mentioned computer languages, but without the accompanying information in the sub-bullets:
<ul id = 'languages'>
<li>SQL</li>
<ul>
<li>Databases</li>
<li>Query Language</li>
</ul>
<li>R</li>
<ul>
<li>Collection</li>
<li>Analysis</li>
<li>Visualization</li>
</ul>
<li>Python</li>
</ul>
Este exercício faz parte do curso
Web Scraping in R
Exercício interativo prático
Experimente este exercício completando este código de exemplo.
# Extract the text of all list elements
languages_html %>%
___ %>%
___