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FreshLists skeleton

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Nathan McCarty 2025-03-15 18:22:52 -04:00
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projects/Idris/Idris.ipkg
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@ -19,6 +19,7 @@ authors = "Nathan McCarty"
modules = Idris
, Posts.HelloWorld
, LessMacrosMoreTypes.Printf
, DependentNuggets.FreshLists
-- main file (i.e. file to load at REPL)
-- main =

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projects/Idris/src/DependentNuggets/FreshLists.md Normal file
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# FreshLists: Containers That Only Accept "Fresh" Elements
```idris hide
module DependentNuggets.FreshLists
```
When programming, we quite frequently encounter the for a data structure that can contain at most one of each given element. Typically, we would use a `Set`, which satisfies this constraint, but does so as a runtime invariant that must be taken on trust, and results in ergonomic concerns when used as a component of API design.