---
title: 'Control flow in depth'
part: 'Part III — The Language'
partNumber: 3
order: 3
subtitle: 'repeat, for, while, break, and continue'
---

_Content coming soon._ `step` is introduced here as a contextual `for`-header keyword, not a
globally reserved name.

<Run>{`// A density-graded spiral using for
for r = 4 to 40 step 3 [
  fd r  rt 30
]`}</Run>

<Checkpoint chapterId="ch-15">Chapter content coming soon.</Checkpoint>