How to hide code in RMarkdown, with option to see it

Question

I\'m writing an RMarkdown document in which I\'d like to re-run some chunks (5 to 9). There\'s no need to display these chunks again, so I considered using

Answer 1

This has been made much easier with the rmarkdown package, which did not exist three years ago. Basically you just turn on "code folding": http://rmarkdown.rstudio.com/html_document_format.html#code_folding. You no longer have to write any JavaScript.

E.g.

---
title: "Habits"
output:
  html_document:
    code_folding: hide
---