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lizschwab
approved these changes
Sep 24, 2026
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The basics
The details
Resolves
Fixes #10486
Proposed Changes
Adds a mutators codelab
Reason for Changes
Mutators are one of the more complex parts of Blockly, so it's important to have a codelab that fully covers how to make a custom one.
I opted to use context menus for custom UI because it's one of the simplest options for teaching purposes. I do think that a context menu mutator is not ideal (since it's not very discoverable and feels odd to change the block state via a context menu) but I noted that in the codelab.
Test Coverage
Ran through all the steps manually and everything works as intended.
Documentation
n/a
Additional Information
I've added alt text for this codelab's new thumbnail. The other thumbnails should also have alt text, but that will be follow-up work along with updating the thumbnail image for the getting-started codelab.