Stimulus.js
Stimulus is the small JavaScript layer Sundae Club uses when a page needs behavior—toggles, clipboard copy, upload widgets—without adopting a full client framework. Rails stays in charge of HTML; Stimulus connects DOM elements to modest controllers.
The deep-dive stream works through core concepts (controllers, actions, targets, and values) and then applies them to real features, including navigation that combines ViewComponent markup with interactive Stimulus code. Other episodes fold Stimulus into file uploads and admin UI polish.
These clips are a good on-ramp if you know Rails but have avoided front-end sprawl: you get readable HTML, predictable lifecycle hooks, and just enough JavaScript to make the UI feel finished.
Clips
Stimulus basics in a Rails app
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Targets, actions, and refactoring
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Building the clipboard controller
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Values and multiple connections
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Stimulus on the organization switcher
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Client-side upload flow with Uppy
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