This means you can edit data in the list rows and your data source will get updated automatically.
It's all about the dollar signs ($).
Look at the image to see where exactly you need to add them:
Note: These examples come from a book called SwiftUI Views Mastery which is a picture book reference of SwiftUI views and code that’s almost 1,000 pages.
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Start with the free SwiftUI Views Quick Start picture book!